Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91dc622ce8d5c94…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 20:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2dc5001b2d39ac6c28ffb5338aabcef SHA-1: 017a83739ba2c5e10b40aff505229adb0b896433 SHA-256: d91dc622ce8d5c9402948cdeb9dd1f1866c9c73a11caab71c2cbbada8abe4859
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of urgency lures further supports a phishing or scamming attack pattern. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver secondary payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yusungchart.com/userData/board/file/4800659467.pdf In PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/28184035694.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0059e20c---bejupariwidari.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/punekuforivatoj.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/19470041970.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/rekekemetinimuj.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/64450072701.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/183db446992fed0a6ac73954df028a75/boxusuzenozerini.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e7099a30b6b91213f11377cf74c1cfb5/59286360583.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/baraxejivudatav.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/81480139503.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/66917574861.pdfIn PDF document text
    • http://unibox.lv/files/text/lemaxur.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/79962343590.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/gewatodujubim.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/medibekizuxalemukesose.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6k5lr4nou4ovn8kmd81ng8crvn/vuwekox.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jijaradotez.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/vefixa.pdfIn PDF document text
    • https://eventaipei.com/upload/files/44794818638.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb922264b---gupapajexebijemile.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613508822c63f---zusozesezakevak.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db3e475e6a236f52f3a5ed679f59930c/xozabigika.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/11745200232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=root+explorer+android+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10456 bytes
SHA-256: bf47c2c58be8124fa34fc4686b13d4875a2641fbb6403a206459896b8b021683
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 19560 bytes
SHA-256: cf919f0f85ffba89286722ffa5e5a3b486f4bfcee9d41655a5ca195e207b8dfa

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