Malicious PDF — malware analysis report

Static analysis result for SHA-256 766437159f0d22ef…

MALICIOUS

PDF

78.1 KB Created: 2021-07-05 11:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0a738eaee5946f24c09d42485eac8dde SHA-1: 9423724d9d21cbc00566d416850e37aa4beb5faf SHA-256: 766437159f0d22ef9da29bf5d399870e15dcf388f9c69e2847940091ccd026df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is likely a phishing attempt, prompting users to call a fraudulent number. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest the PDF is designed to lead users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=boone+county+probation+and+parole PDF link annotation
    • http://zkojicin.cz/userfiles/file/setixeravipowagut.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160943bf468498---zedipesikuxigabikim.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/vonudinixaruvuvor.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/27075454023.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/savuwuroruvumiwida.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1aeabdba7---33870897162.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/2426033887.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/18caedf88b8bf6b4dcd1f46995ac6a3a/rupesetasewesotimetiwi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d1ec8225---49913994579.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3719f6b4---vujavavo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e9c7d073ba1770394ea694b5ad2147a0/49260046248.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/36114921890.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/98211c37347daa141ceec9ed6a69405b/46411944832.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/mosibapak.pdfIn PDF document text
    • https://senhewood.com/d/files/bepotarusawusisegogutiw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/09cfcf4f53bd60e19cf19967f13678f2/44420628945.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/33221021133.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/71097072059.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ba052a85---37498355528.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ff7c8b6b---11124727261.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbd122dd06637f26dbc8afd2f021e40a/49164584852.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce7a4f809---59984629110.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608817ab56866---82534457690.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a47b21f92---3555042836.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c323a292e---51258554142.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/laxufexot.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/35067459870.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 10744 bytes
SHA-256: db1d6d59f61b798aa5fc5563eae41fa20036c95fadf4b467e4145f8471513031
font_01_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 16444 bytes
SHA-256: 144c4aa2472112a8f988782265672fc00b4fda0402436924fa956901d2c6f2e9

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