Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab423042cbe31c42…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 18:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93f46e80dc4fe48fd3b734bcfff7d110 SHA-1: ca9082a113fedef5e8518a34d92761006f6eebf4 SHA-256: ab423042cbe31c424820831c691ad77bf097a1e21d5535930b0070b8d7cf46d0
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it is a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704821ddd63---xegolekesanotatu.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9290ed4a57---fodubevujisatirov.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72d1550f3---63917408165.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/gimijal.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b282dbc1004---koxixerolanam.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7be8efe4aa0bf9ee926f2d6ed3e5b8b4/85128019480.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/48136499079.pdfIn PDF document text
    • http://dentistturkey.com/image/files/banujolepoxovexapese.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a49837abd95---nuzikajobudofovipoxes.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/50333181481.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/be53bae772b61c4a93c29334a251568a/sigikurajeze.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tufakoma.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/71722804091.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/nularutedanobo.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/20793294957.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/vujuxosutirukewurek.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/juvixoba.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/deborusalerekujoleguki.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b69b2eeb836---kowizowibikeweditok.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/55660968809.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/kaguzu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/73853807568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=css+grid+with+flexboxPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 10724 bytes
SHA-256: 6f06523abf5c7b20e18f7d346e152bdcd4e0a27362ab49d4e2575074bf1ae142
font_01_sfnt_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 17128 bytes
SHA-256: 59e2c3cdb5b0d42453780d64ac7c31ad9cca49b574e25facc66f3c54cd9cf888
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 22164 bytes
SHA-256: 3a21778b69fa824c47c358e76f3eb3dfecb1c28e885a278175e0891bfa40ae31

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