Malicious PDF — malware analysis report

Static analysis result for SHA-256 faea3a7d39f0f161…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 14:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: deead62054e26ea81a0026635dbc2024 SHA-1: d76f7ff1f5ec9f11e1dd01fbe274890e7803f2dc SHA-256: faea3a7d39f0f161871d1f2483330528fb9444b92f10944a52015f860d47d424
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates social engineering tactics that may trick users into executing commands, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+do+i+access+the+sd+card+on+my+android PDF link annotation
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gufip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d1681bab---puwanofajosixoxigisak.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/66435611079.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/defanetofagizopo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba4f9e9a1---60609297487.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/xemekutuz.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/5878402429.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/16298748819.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/68767633951.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/11476290582.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dea0878f83---witapu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/pivixelukojuwebigufudim.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a1a56e1---46833229609.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/bavuzowudefaso.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xowozoletupubogaguvek.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f51d5461---bufumevedatesovofuxebarig.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gotefopemofaroxepukobapad.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210917143804.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/xazapawel.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/dixobot.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nivowewasagifaravo.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/radawosepewivesibev.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_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 19008 bytes
SHA-256: e0ef90774d585374e0dae5bd90600fce1a32b185e7b50c50ae22fe74f6d7835e
font_02_sfnt_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 10780 bytes
SHA-256: cedddef98774044bb6894a7bafa362e5c92141abcbb0b217963942ed13fb34a3

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