Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67b6cd4433c6585…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 18:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85726c7d419eb223b265c318afa4bb1d SHA-1: 33e53126da635918fe1788f838055ab5285270aa SHA-256: f67b6cd4433c6585fb6f22a686a5bc944b171e169cf116515385bc877182d6d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable domains, indicative of a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fairway.cc/images/blog/file/bilunejowekeviri.pdf In PDF document text
    • http://lejuriste.ru/files/file/sizefatitemaz.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/bokef.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/pofupazomukafalazapubewu.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/28147461636.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/6794501617.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/fomusojur.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/85889412385.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/ziwifugifer.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/51fd4d7f2c54a36bdd2a012dc785a907/14344240108.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/89418575605.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/bajoxugulujozidoxejakeke.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/96391017325.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/06faf7f3d853358e0e69c869c8c1f2c9/fejukidumowigopubet.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zanudipawagokenigasava.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/35679830124.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/murujawemawozaxasedabi.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/91998679802.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/84126722471.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/puwebiru.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/bezazedisek.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/20952837117.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/43422848598.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/mojelujulorisabokugurobal.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132079a36dee---wofozanapuvadunaresuton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+set+individual+ringtones+on+my+androidPDF link annotation
    • http://irodori.kir.jp/files/file/95106126736.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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10948 bytes
SHA-256: 7a4989cd7d23ac144657b7785f02e546d904480bd28809e6505c3e88dfea3a20
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 17664 bytes
SHA-256: b7652cde877c4c4a9efa369e23ac82df9b189a32f799fbfc8e93062b6f4f5725
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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