Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d792c2a50b0907…

MALICIOUS

PDF

91.5 KB Created: 2021-07-05 20:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e2b20d76731dc62f6585f80e6d6a54d SHA-1: 499853cba2d4f9d4068bbb12dc78d6a77903910b SHA-256: a8d792c2a50b09071857730b2538703af0b8120c0cc554fa13f929c31586c1b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=little+nightmares+2+ppsspp+android+download
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789331134b0---fezusilezexeveb.pdf
    • http://lelit.nl/app/webroot/files/userfiles/files/posagisitizugoteruded.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4to8p2n7gkbqab72gq9khpuft3/besudorewizow.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/178a807e26cb234c4e9839eddd7a5905/30312025019.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6620b47684---luxowojobexebutavo.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/fq0602s03vurkp588vm7dtlrng/jazopasavotinewa.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jejobimanedumuvosoxav.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbc42a822e---tudekivipizupatafitas.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e4427034---1450542168.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc12def665---bifugob.pdf
    • http://longvu.vn/Images_upload/files/pononerixi.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/443df68345c039fa00c72409cd0770ba/19259749632.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/faef85c4f87740621be677174b5160ad/50408150644.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836348f2964---pukenotu.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a525926c---89329079541.pdf
    • http://elcampoeco.org/FCKeditor/file/66386298494.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5d50f95ac9a6521979c47c68273bf27d/27946063606.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede47ee1e8---34637245920.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c245c4bdd---48833601801.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e12f9b34056---51764765383.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4968364a---90259891382.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/80306473414.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ff54a998944ddd0c1628de8cf045e201/90103914690.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d5a9120cdf5c6d380ca8fae2ff3f65f7/74885931816.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
font_01_sfnt_off000103ab.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 16092 bytes
font_02_sfnt_off000118f1.bin
3e1d05d80024ade7aa41fe75f518299a1fc8d89dccadf48ab7d4a77d8805afd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 11000 bytes
font_03_sfnt_off00013225.bin
51e0d874a7be246423c17b8a56b578ca50ac997496baf4e22e48e0c65544a503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 17916 bytes

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