Malicious PDF — malware analysis report

Static analysis result for SHA-256 642429ae9d97a446…

MALICIOUS

PDF

94.2 KB Created: 2021-07-20 11:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8ed1aada70df11881274074c5c1129ad SHA-1: 34f9c0233810b3c9794757bb2ae446bae6b45bbc SHA-256: 642429ae9d97a4462245e72bb71346e6db32c7f61f144d7c908e99bb4f2070e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into making a phone call for fraudulent purposes, likely a tech-support scam or callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point to a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a74479613---megawufukixun.pdf In PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/24037313275.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c4f6b139e4ca892e53deb5a06b3626fe/87709655186.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd64412aea5---10205105104.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/sudob.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/30751388043.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/93012252409.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/bujipepoxogogo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/jajomowaxujenominiz.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75df0ee005---86840882244.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce27786bac---26021910102.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6644f93db0---xixetosezuximosekepaxix.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085568c7c9fb---30838430941.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8789e1aff---67067413523.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/da744d443048cd81d58bc5b052c7e40f/9462842910.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gemodeduzex.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/32092487674.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/pfq6s72olu27glr9ghdr007qlk/sefulurubiwawa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff67182c23---40414226585.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/86811146646.pdfIn PDF document text
    • http://licausi.it/userfiles/files/gikomafa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e6cb967---99073329516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=solicitor+england+and+walesPDF 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_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10708 bytes
SHA-256: 25e25e4830cffc05236193d1606771b30ee4850ba4988a512c433c14cec11962
font_01_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 17876 bytes
SHA-256: 38f04f68ecdc21b7e4b850cbc84eb1009b483066798ba7d233e6f6fa5dacbce3

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