Malicious PDF — malware analysis report

Static analysis result for SHA-256 6478f3c1b05dddeb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 00:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38eb5078882abe96815d90a53ed7b610 SHA-1: 054fb0bb67044c212128ab4d4f4c6ee572a83d9e SHA-256: 6478f3c1b05dddebef73ef3f0de41e5a12a7cb16e39c18b27c3696e6c084e4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or domains designed for link farming, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly support its malicious nature. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=best+website+for+downloading+ppsspp+games PDF link annotation
    • https://fajndoktor.cz/images/file/files/wasedatasafopeve.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/85789028058.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89807562ad82f34cc5471db0e174441d/fubivelavabujukumoxadota.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c3063c50---dajeseguji.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2982271b6---motiruladopagezef.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gamivumizuto.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zugoreturofizelonuvow.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/41688780592.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907103335709.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2912ce49b---51607697350.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/48850397251.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/46158702366.pdfIn PDF document text
    • http://kustari.net/userfiles/file/52575064702.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/38314999245.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/mupavis.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/28186184087.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/44129360966.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/fobujonoposedejaduramitot.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/18578548132.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/lomutavijiwite.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/julofusevevixanux.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/sigufowarefunok.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 17692 bytes
SHA-256: 6deea2c3fdf309d4f13c4735bbcace7160fe5aba4bd68e22ef728734ed3c00cc
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 11120 bytes
SHA-256: 9b189e53e370a816086f96e87f5945a55c07527bd6c039fdd89d7981701c307d

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