Malicious PDF — malware analysis report

Static analysis result for SHA-256 408573cc372da529…

MALICIOUS

PDF

87.4 KB Created: 2021-10-07 01:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3ae3f62feba71efcf8cd00b75c5ba13 SHA-1: 93997d7082c397f67e13b6d7d1bb3c8a1732a8d3 SHA-256: 408573cc372da5295318e5035ded34236f7a78005d722db566a3528b650e4769
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a phone number for a fake support or billing issue. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML classification and ClamAV detection, strongly suggests malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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) 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://crysiq.ru/uplcv?utm_term=the+african+apostolic+church+prophecy PDF link annotation
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497400d441c---pomobogikini.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/fetodesag.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/suvod.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588cd00db1d---kagujevigutubekado.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/44497664754.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/42563919286.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/96534991237.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/2409813923.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/19817983692.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/77225146303.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/58026267005.pdfIn PDF document text
    • http://sswjeans.com/files/jepoval.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pulibokilapujevujonijuzu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/69601743352.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/54081086594.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7a2aa8741---pawiribaxetomokozufogavup.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/18142398466.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/54938488647.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea13586da---litefezejulezemamejinari.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136108cc3347---26443577568.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d163e60813dae85cef24b54d15aec463/78683978149.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614387042a232---fadava.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1084a80ec---13063475248.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/62812369727.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a775b4c1---38950216798.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10756 bytes
SHA-256: f20f2e0116100bc3659d5b73cbae81e4c9403b8b90a310bcf21f7d50423f5b5a
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 18756 bytes
SHA-256: 40d0a90ff5765726c9b20910024c6e3fd3ad7a3b70d80c4ce7d27f00b07f6940

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