Malicious PDF — malware analysis report

Static analysis result for SHA-256 b801829603653c43…

MALICIOUS

PDF

82.4 KB Created: 2021-07-31 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf8b7de6d6bef6c3028b660f5b00c61a SHA-1: 787c72aac81909c78c88d799cbfd3c7f3d5faf0f SHA-256: b801829603653c43b4d4d84884344b83f15c3c0b4b31a0431f4fd87622368ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://inwebjor.ru/uplcv?utm_term=paraclisul+maicii+domnului+indrumatoarea PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fd31171f---13846357330.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/86503730822.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608622fff1726---35692459826.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1o49b722nvf75gi0mb88ci1oe5/refemuradimokax.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/37520937075.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/btujfjficrni8hsr7plgbl662l/23795893835.pdfIn PDF document text
    • http://deforma.it/userfiles/files/kipuvafonug.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/7974017135.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/5aaee681c7e5a2560115e318276ac94f/98302671237.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0f687072---56463137509.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210617105951_gyu2vi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9851d494e9---19073896596.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08f7e887f071601223bceb382ad3f1ba/76150544494.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/627fb21b6cb7b1a1d9af590caad2f2cd/49692810116.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/72268779262.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bejemosebaforuxo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fa7ca230b4d1106d7b1b4e8b5c8a3acb/xalojebiwimaxuv.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/mopofepavosudove.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fftj676su06so4nbsvm7e7i4sm/xefixotezedobilupesinus.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/762d91753d49540416bc0eff2e05d98e/petunel.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77326406915.pdfIn PDF document text
    • https://ptogel2.com/contents//files/jirabu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160895394c86a9---pitusitofuxovevosoja.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/malawekopeje.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519232131483831.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/17/file/nuzamazizug.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10632 bytes
SHA-256: cee70b15fa222b042d8491bd3afb189211476a02ebf57a3ef532b9bfe2c59010
font_02_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 18364 bytes
SHA-256: 99dea3bfe030e4f212bb218077898fd433c420f5130dfaadea5a0237a65c0ec4

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