Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28604e5e4d94362…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 23:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5cdb0c103e99faed460ba930c5ebdc4 SHA-1: a324651c09e0f57ce44fd33d80c0b53975d7e667 SHA-256: b28604e5e4d943624fcf0fe149807dbc3c19e539f1225b3a1f54acb6f93a3496
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://neo-net.info/giganet/files/file/tadobaxa.pdf In PDF document text
    • http://gabortech.com/admin/file/66694756930.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/dojuwifowobofewezesugofi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3b4d9cc44bc6ca32b7c6862a9d134bd0/8333354903.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/74796880908.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/botijuk.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/59050149098.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2c6blnrtl1khbj43b5g59kue04/42714853832.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/782fd8b50a08dc4c03e7ae83781faef3/94572931102.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/nugobejojabigagamijegi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/069kev50g798bjhl0o5v51dhl5/todelajapunonedonulimore.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e171d2a56---madovivesuve.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/sojikelotig.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/dakatogeseduvegogepa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/lefixadevejeru.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd61b48a79---fotejogajegumubujewafuzum.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e30c33be035ac3367fb3ba2a2d942b02/pusevisapi.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/luzavekodejonuti.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/21556550988.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/22250239979.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e82643a0---buxekona.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rhkklmcdfhkcfoolrfk3qso7vb/mikom.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxuzok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+trillerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10012 bytes
SHA-256: a68d5798897592eb7b1db2506edbe6cda2ba0f84d38098dafe70e290f9df9d12
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 17372 bytes
SHA-256: c4133b4b4cbc0b6bfad8f711b09e60bd5226e6e7ec4ad853d040cc28e14b55d1

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