Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc053ac1599e02d…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 11:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b48a1fed97b42a0dc49a4ed88f028e7 SHA-1: 8b4f900328cae4372f446686aa4e6ae6dca74c7e SHA-256: cdc053ac1599e02dc3ef570bd552bdc2986a8a70cf6a2e9bce01a8caa0d5a2b6
156 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. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=clutch+actuating+mechanism+pdf PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/b9nr18ppsckoh9oi7lgpr6h8h3/13370869052.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25c993961---gopiwusuvupobujovikoduze.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/jutixuxadufijevelopiwu.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/muboloruvabevogos.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed004a53fd---norojewewugukisi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/008cb76cfbbf600d4e5185db3b3abefc/22683826377.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ttrm8b5tg65o8oq77tfjiccnk2/40042223488.pdfIn PDF document text
    • https://funke.be/data/file/witive.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/daziwinuxebalidov.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fc4868c0---xusesile.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8f4deb36---15677204411.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/77990804470.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8e6367b---97857932422.pdfIn PDF document text
    • http://ellev.fr/upload/files/lusigam.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/bc2f6ede930e75a66480730f76b6ee22/37982744442.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c5ec68ed62738fd201f0ad14db0568d8/mepesanafagujobobumor.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0b1ee5e6---rurutujupubatala.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/susixojurewezisorepurox.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/begolimefozud.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/juribenoruduzexuzo.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/38773159665.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/37729872749.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zabedetepilox.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pp675jfqq6kife1ljgc5sv0ju9/3992138931.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_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10980 bytes
SHA-256: 3554e10b0f4d5bd95927779d58ed1f5bfce5980334b238649e984ee761ded7bf
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 17700 bytes
SHA-256: 5d3870fa12e802fce074a48279420646dd9ef77bbb0b19d552dfaabd21d820b5

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