Malicious PDF — malware analysis report

Static analysis result for SHA-256 527fe5c571385950…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 16:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8a54fa7d83a48e2f6b4045615d2362a SHA-1: 0f622f0f53ce3b36f7d231e3a6391850ac79e288 SHA-256: 527fe5c5713859502f49621e496ad71d26011488e9fc7b545d76c02e1a3e6763
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the 'callback lure' heuristic indicate an attempt to engage the user, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086826c1e555---60203679488.pdf In PDF document text
    • https://quatden.vn/webroot/img/files/junakosexesabowonigugu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/285e208eaa6c0209c57d3bc9408b9f8c/wovot.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/7835371251.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71da4964d---zudepazape.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/31683953837.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f585ce7b2---92369101740.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/35095587596.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6967a461---83570722300.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d04480a1---zepazeluduvivi.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bb9f33e2fbcc6200efc3869cccdb58d4/vifipopuwaxupof.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/mumaduxazuwibozefonasoxi.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/29740343076.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1u6a7hpdrcdss1me1v05381qh2/mojigaguvabesepaniwatuzu.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/27004829885.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050523590687.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/913e490513829d46417a3d55b5d7a55d/98852574170.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/romija.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621dba3f00---sivifotukejarisesogajifu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/546d7025cf2534e3864ba230f3c1c2de/zozonularuzomarus.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xujevu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8b08da96---koseverafomuzabetorivu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/132f5f037b29c73d4e57c408f1260aed/59000986853.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/diwurivo.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/12763600473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=egypt+travel+guide+book+pdfPDF link annotation
    • 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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 18052 bytes
SHA-256: 1bd98458bf8e172c9bc4b23450fda3d36cc814da3880e80b5de37ffd851d2cb5
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10896 bytes
SHA-256: 10810310d0fd21747664394677efcb6664cb5929ca6279f83511d0efce2a7070
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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