Malicious PDF — malware analysis report

Static analysis result for SHA-256 e140aae756bbabe8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 06:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dccadf70790d1e37492f97d7dff6fad5 SHA-1: b29b2640173dd586d81bf6ba7f63948313ee4959 SHA-256: e140aae756bbabe88eb70a3fc9dff153830719d89536f23529b4180b0df0c156
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress uploads and potentially hosts malicious PDFs. The document also contains a callback lure, instructing users to call a phone number for deceptive purposes, which is a common tactic in tech-support scams and phishing campaigns. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to lead the user to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315d2657017---talikibakumupe.pdf In PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bixoxitulovovosefitoxi.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/7850338536.pdfIn PDF document text
    • http://qdcmd.com/data/files/85586312270.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/52113486631.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/falifemonidigez.pdfIn macro / runtime command snippet
    • http://armanetti.com/images/75826342416.pdfIn macro / runtime command snippet
    • http://thingsantiquesla.com/userfiles/files/12286604920.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c168e655---sunisod.pdfIn PDF document text
    • https://onlinendttraining.com/files/watipamobo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba4695c1c---lofelexivivalumuk.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tajinevasedexikuzusi.pdfIn PDF document text
    • http://techmechengineers.com/uploads/jomenumejawewowejata.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jojufiwerep.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dcl5q3bdv20rpvjrj69qrkd510/90464188285.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/pelavasupilifovesojavowup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7b3716e---tixazurerelemazalo.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/magulejupifafinodo.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nowalepopujal.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90066327726.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/gawomiw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/djnrl83dc2gbkqcpo43iosro87/5062101432.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/92658864334.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/54844531275.pdfIn PDF document text
    • http://funkyspa.net/ckfinIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wifi+analyzer+pro+apkPDF 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 18040 bytes
SHA-256: 7cf6362eddf869646c5daf5b4a9ab62d4cf894f765e01252b6f749b89808d991
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 10344 bytes
SHA-256: f418fc2b618ce9bef8e6dc0331fde1258d687e6060cf0d1ae4e841ffddb2fff4

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