Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f835973fd99049…

MALICIOUS

PDF

92.3 KB Created: 2021-10-16 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c16a9c5903b41a12f6a04adbe89dce83 SHA-1: ba0e466f2e3f1832d56487c5b7bc484ead009e95 SHA-256: f9f835973fd99049c7b7aaeb9d4e2bbea82cec4cca612b9d4e2eefc4ee609e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/lupixojoxadokadijokuber.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/28382243199.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1d5eaecc---3759944177.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wipemi.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/23153227774.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7b4826b1cf2c6e36f8728ed1d90a334e/12567301458.pdfIn PDF document text
    • http://alltechsro.cz/files/43742465946.pdfIn PDF document text
    • http://enricobarraco.com/files/pepenufazimaxunizabi.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/98829841764.pdfIn PDF document text
    • https://cnprint.ro/userfiles/file/vutapan.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/44196662322.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/jamitodabi.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/97252899793.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26712778265.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9521380960.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/zubuladokor.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pupujagar.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/namunexotikemaw.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/benozusavidifu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614430cd0ad28---sudomubapibofanonanidisen.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20211009135520.pdfIn PDF document text
    • http://nessium.net/userfiles/file/10393052036.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/lesuvo.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/nupomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=starting+the+downswingPDF 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_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 18216 bytes
SHA-256: d93eeea7e4a06b861a68a569996a949759f57918bb13bec098083112f93e370a
font_01_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 10640 bytes
SHA-256: e39f8efc453f22321c2708bbcfcd7f5974ead8919d79276802d4d0b52c8c3f9f
font_02_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1