Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f91427d0a708950…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 14:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 12bfd4ccf93197f4e0b0c8bcf0ed206c SHA-1: 743e14f955a45f91e1dd8822ff0291ade72c2904 SHA-256: 1f91427d0a7089504a30db5cad53c9f6a1d07dd2202679c4576384bc3c811615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://robotsuk.com/luckingbros.co.uk/userfiles/files/49514080527.pdf In PDF document text
    • https://yarpaket.ru/userfiles/file/17975372433.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/24704229181.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/newadowetafan.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021610d6b4---pejinukutepegusava.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wasababiralusuxazorolomu.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wakabori.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/bupodaxonagezikebozemik.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918180714.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/64345758020.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/62546703725.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/rivuluv.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/41130044047.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/57206687749.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/18071464526.pdfIn PDF document text
    • http://nemochem.cn/upload/files/47674700269.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/63374805640.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/96482ffcab1c87f3b0866bbcb1adeea0/20037699720.pdfIn PDF document text
    • http://chamdure.com/DATA/files/muvefusalitikunudufuraru.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/425e168fa4e5c5859eae6aac278e3a92/gunidabokelid.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dumadovo.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/92772641623.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/88727804486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=app+oreo+tvPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2cdb001795f94f4ae15fa1f8da7c99a5/91890504930.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_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 16504 bytes
SHA-256: 1d8b8c99df0a7648ba44d5f37f3f34dd2e58686b2aa8a8e619c7b46a0ea8dbad
font_01_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 9720 bytes
SHA-256: a35c41df12d9a62fcf49896e677be17850b1667b9abeafafb58a933a4e03275b

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