Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a493b271ca86ac7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 22:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85a64971aafcb2f5233f11e944b99928 SHA-1: aa93a2b11606e88e6c9ad5d32dfb07308209c4a1 SHA-256: 2a493b271ca86ac78f0f683473b5b40c172f06e85b69e71401fecae7813c7d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to various domains, many of which are structured as link farms for software downloads, a common lure for phishing or malware distribution. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable hosting, suggesting a pattern of malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=super+mario+game+free+download+for+windows+7+32+bit
    • http://ergakiland.ru/files/files/84379604631.pdf
    • https://pnlcoach.com/misc2/file/
    • https://onderhoudnlgarantie.nl/upload/file/zodoremeboleturil.pdf
    • http://phannhan.vn/files/usersfiles/files/xexisamabuva.pdf
    • http://www.photonics-science.com/ckfinder/userfiles/files/bovefetabikor.pdf
    • http://kcntanduc.vn/img_duhoc/files/biwazaxulitefuvexisal.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c78c6bcb---xomonisezis.pdf
    • http://jrpst.pl/userfiles/file/didilunajajodukuvikedasol.pdf
    • https://poganyvolgyi.hu/userfiles/file/pepigakifafoxumazuze.pdf
    • https://fivetc.net/uploads/files/gibupuxa.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527845646e---fiwinerurike.pdf
    • http://goldenteriyaki.com/uploads/files/pefijirakenasamosob.pdf
    • https://millinerandassoc.com/files/file/41895813462.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexedowuvaxilaw.pdf
    • http://decorstore.eu/upload/file/53418821480.pdf
    • https://pontus-sd.eu/uploads/file/sisizorolufaxorev.pdf
    • http://happy-land.hu/editor_up/79066404138.pdf
    • http://gediklimakinahidrolik.com/resimler/files/vajiwavos.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2ad4cdcf---rotag.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/36506252263.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/zagekewademuber.pdf
    • https://biharlokmanch.org/userfiles/file/11737872088.pdf
    • http://modaxch.com/userfiles/files/70203931397.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/25138645a8ee9af7bbaf03d9b91e13f4/57353593315.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafa.bin
50344674f9ef2106f5934b14ca2939118c5a291d8134b24f322e28f6228e1ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16400 bytes
font_01_sfnt_off00010554.bin
96729638685b588a8704aff7a084192346bc535eb5239ad1c834820c272f8ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11584 bytes
font_02_sfnt_off00012094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes