Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d3b06245648406…

MALICIOUS

PDF

80.3 KB Created: 2021-07-27 19:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6594a53f533ce448cf429f6b414e808 SHA-1: 6e2f98fea831325e3ed86cc56aa097031a965429 SHA-256: 99d3b06245648406572ca324e777a568431f332b8ce66b20dd90243a3b7adb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 https://maturana.cl/upload/file/28522337020.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160793dc002d8f---retenivufogutavuwexojegas.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/10ed7234d36bd3d386ef904d29eef87d/kobamikivegexulamunawodit.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094140e2a611---70352230681.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/pawigulojopuvavaremam.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c45b91b8062098b57d2f604d053ade11/zuzunonuvikiv.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9d364466---88268997950.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/sabmmrvql0cv1v621kgsmpp38c/55040241841.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/15189357215.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ebe4179d3ef5984dd4ab16358c76bed9/ririgedidakuvugokolifuko.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i552r3g74qtvqd5s6pvtfhli91/fijemixulewujob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef323151dc---23720790478.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c768e65451---zujanubidalezo.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gugab.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/botovu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lavipemalasiwigi.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/45390052804.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9048b7660f55fc0a4e7fbe460a4c38e7/zajazesoluvewu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/72841500544.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6fbeee3d99961ddef9981389e17ab15d/29426802013.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/27277919981.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/varalowaxu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/xuvodenitefafekizixis.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/91248065356.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/xezijol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pegem+kpss+co%C4%9Frafya+soru+bankas%C4%B1+pdf+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 17552 bytes
SHA-256: 42984e6cdb3f8a6f09572ff21604afaa7fef33322af587b7b4719081c345f447
font_02_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 11548 bytes
SHA-256: 7d6015a4ab1a6bb85009fe313f8c4b2c3d8aeec69d10457d5b5b2476fcfe67e5

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