Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dd8bb0f53c8fa2…

MALICIOUS

PDF

90.2 KB Created: 2021-07-30 23:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8e8e4f0e86929c2eef57b9ee776ec38 SHA-1: 7289e199b3cf0ea612c546afd7bfff65a1771bbb SHA-256: a9dd8bb0f53c8fa2e5582a8bb63267b141655ff8aa28144787804c1708533d6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fence-alarm.com/userfiles/files/rumenoxubatajifexalan.pdf In PDF document text
    • http://jtylek.pl/Upload/file/76765992289.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01bad70975---lodapobivisisazirafafi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608873d170357---juzujajugegelesajud.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc361431c8---24061712738.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/88291802186.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081836f69347---13893234642.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0f1cdc5d728d79fbbab3a51b51f3917b/39945202852.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/61904907805.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jjqhdkpogh5aifchnvruvcsg6n/kabaduzuwurokededujukoj.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/xoribozewose.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0a37c8c7---sipup.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/91063268572.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/vewimivepovo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f9a06897---38882738786.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wofajimiboduda.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4da00c1a---87264214899.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/62009748908.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b40ab5d---49277161285.pdfIn PDF document text
    • https://kenadong.com/contents//files/zipix.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/49971055875.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672eee17cd---82131574252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=months+of+the+year+worksheet+for+kgPDF 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_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 18364 bytes
SHA-256: 320e988fe7ea5638c33825fc9900c1456d0e228d75dc60cbe52423e0d374ed1b
font_01_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 10640 bytes
SHA-256: cc43f214fd4587afc34ad7354f165383881789fff7bfdd0cd86c23bf3530d202

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