Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b4d615bee521a0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 02:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4227e852499d723bb929d1664ff1e1a6 SHA-1: 34b83be1b1e6ad1589ba9622fffd8d49e28f7766 SHA-256: 44b4d615bee521a0a4bdf5b9e78829d39ccabaedd70978c756419216e26a0f40
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attack pattern involving spearphishing attachments designed to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://schokoladenfontaene.de/idata/rewovufatasitarupokixopas.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161122e21dd333---ligunirokepenulefavi.pdfIn PDF document text
    • https://ikima.fr/uploads/file/51913940488.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gademubezomojerelabo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcan93m5ahl4lu7gdqd012ae5c/16604616458.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0ed4bf973---metirasatilatir.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a959ef40fc---38955336499.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/14534961913.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/51228097423.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/zujedujasasifatokajiji.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b722c67db9b---35071250955.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/72071699471.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/61928797106.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/femososubovutijuzesadatiz.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/vesafigago.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/megatalu.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/40716466762.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/38892708400.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/ziwujemugiz.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/jebipadozote.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/40335771687.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/usrg65dbdctu7t6a02d9sve536/92506959339.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/44eicq4r3ltpgucspg1ktmg805/63953050806.pdfIn PDF document text
    • https://aaaxxion.info/images/file/siwuzifoju.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=infographiste+formation+pdfPDF 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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 17532 bytes
SHA-256: 9fe4142fe0d3ed53b40f01d3a06b61adfe96c2651a89ee7972d01d9cf756e32a
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 10848 bytes
SHA-256: 10a0a5490ec048b47a81b4ca7d48949defc12c0fab3105479c8589bc973adf8b
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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