Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b99849901f611b…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 18:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a23dc49f3ba72423cdedff6f8ee4fd SHA-1: 9e23c1d68831cc081576d04120f8304c9538e140 SHA-256: a2b99849901f611b995e99f8061aa54e04bd218972ecd000a9a72ac6a888cc12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://catamma.ru/uplcv?utm_term=amenaza+de+aborto+pdf+2017
    • http://nousgarage.com/userfiles/file/vepaxo.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/71ce98d9b06651b01918d860a2aba01d/52206931310.pdf
    • http://nineslash.com/user_file/file/14814399103.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3cf0a2da---zuxifibivew.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d11643716---30656327367.pdf
    • https://securitydm.rs/slicice/file/38271295150.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/boxezowiwix.pdf
    • http://ritadas.in/userfiles/file/69610973328.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796af154fd6---80269940799.pdf
    • https://northcoteplaza.com/userfiles/file/57667852829.pdf
    • https://songhongresort.com/img/files/kudaligesusabajaka.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7c2ee29706cc701ecba45c1e3c93cd67/rejupisuxewojevage.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c1a8d77c---9032202420.pdf
    • http://carrozzeriardue.it/userfiles/files/42800574855.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80e238e41---wekizajadobukodupebexezu.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/47472705270.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608019b752394---32634716372.pdf
    • http://obrienbuilders.com/userfiles/file/gexigajolelamiwusitox.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cf4643a6---36809513879.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e8c009cb391e4ca26df66477bcee1c22/38593461399.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f485f87f---xurukatenowopelabutamef.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/30015215987.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a796b9ef---foromesoluludesegewer.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2090953062.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210818_195205.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_off0000e294.bin
741250dc8a52e5e1229a68ed0eab3780f1f684b185aa2b850ab5dc9fb20313e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10876 bytes
font_01_sfnt_off0000fb95.bin
8315da1d7c01026f2f4c64985bc065d2df54afcaf3635c892f5c87a976e7af90
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 17780 bytes
font_02_sfnt_off00011701.bin
8e391d863d9c9f0c27afb32cca9d444ffe807f21193c0269c24d6cfbf06be7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 19704 bytes
font_03_sfnt_off0001491a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1491A 16792 bytes