Malicious PDF — malware analysis report

Static analysis result for SHA-256 98528f437fff75ae…

MALICIOUS

PDF

125.8 KB Created: 2021-07-29 09:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91da370a2560e1df02b71318fd8d9a4c SHA-1: 116cd95011ae4a05dbc3b2c02ebaf4eef90ae6b2 SHA-256: 98528f437fff75aeffeb3542eb6b6423fe407789b7e80e014def986f679f5f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the structure points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d83ec659436---8194212634.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/276571i7rn78521pm7dq2mqnq0/59891147618.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd14fb6331---11965354924.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/zulisowafulefakobedula.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3b9570c248d30ed4eb0d3f9fbaaa9db5/vujozagegonapi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160daa91a1b832---masil.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/giwurogaxanuwudigupip.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96348530762.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29432b3413---68420857306.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tokip.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a29c9ed79d875b8d175246ddcda93972/zujutujizizeveg.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e2f58460---jabaj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f320b12b0e4---xilolavamamadixobisefes.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/xibukukamov.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/joxewujixod.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/fazux.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tuwinagewedarerewoxojela.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074485918d3c---49411351484.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1bc6d96---kajurodewovimuladamupesiw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/78c89da05edec04643d4511fd48d5251/12255675297.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/40989038320.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b79193ab3---jibapewawimozasewelekobir.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/bd1df500a0d1cd5f3f5aaa06e1cd5afc/74001934355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jeux+de+carte+loup+garou+%C3%A0+imprimerPDF 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_off0001764b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1764B 10964 bytes
SHA-256: 29521a228d5a8b494c85d32e66b79af9d0a80eac7308490aadc264042e57ce2b
font_01_sfnt_off00018f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F20 2784 bytes
SHA-256: 98a761d6f0774c958138784bc69da4626b64b40f4de0aac6778aac458ad4d09a
font_02_sfnt_off00019ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE8 20480 bytes
SHA-256: 018f32f7dbef57fe0c281a2d59f1cba8ab584707a0bb253ff7509e61f3c81ad9
font_03_sfnt_off0001ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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