Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd90454c957b82e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 08:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab16abb513aee547e182c87c47d1cc74 SHA-1: 37b9884a0abb5ef4324ee514ed97927396f84906 SHA-256: 1fd90454c957b82ee16305620943170cc235fb1eee2fc5c7572f6301dad6173c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by leading them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chineseclothingonline.com/File/gafofarabumalitot.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d5ebed72d095067753072d760884818/14871367194.pdf
    • http://eurolocal.info/sites/default/files/images/file/96964870476.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/xikon.pdf
    • http://cokhilegia.com/upload/files/4570475406.pdf
    • http://abwferrellpkwy.com/uploads/files/39983952904.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/00viqb8gur5qq5c80gp8ga4snt/96041509002.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865bf6ba188---32916113168.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95df74a8f---4960331061.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/jutagadugebabe.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eim6ga6cnb4hqdoorouurvqof7/92725427640.pdf
    • http://sklepjola.pl/userfiles/file/92220942347.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/41629023940.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f91e1e52---bubajufolexidigimijajapow.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085db98735c7---wezobowosuketekopubomox.pdf
    • https://leosservices.com/userfiles/file/25001165134.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb634bce9---76040577801.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/dunanakowo.pdf
    • https://camping-du-lac-dijon.com/fichiers/79722614461.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/63572485310.pdf
    • http://taiwanglassgroup.cn/userfiles/file/fufoxobode.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984016f0056---37604040393.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ab50cd50fc8e8320da899b84ad718b37/93786897860.pdf
    • http://cbafjvn.com/uploads/userfiles/file/kagenozajede.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=critical+thinking+in+medicine+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_off0000b8cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 16792 bytes
font_01_sfnt_off0000d0dd.bin
871428a454aa51e5b795a02b61372bad90d44b2398f272bdb07507ce4ad9e6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 15812 bytes
font_02_sfnt_off0000f8ea.bin
a41435251407146abc29963c6304bec9b3bce61b9e1623b4081f7eece5268ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10904 bytes