Malicious PDF — malware analysis report

Static analysis result for SHA-256 58acdc3192e070d0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-16 19:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b951eb14d882a8d17c50f147964bd730 SHA-1: f7ea7eaf336fb9d218ea213c7d2433055bf97c76 SHA-256: 58acdc3192e070d030f02d098c2624226a3ff51c9179c9c4bc73697ec0c700a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm or distribution mechanism. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious PDFs hosted on compromised sites suggests an attempt to lure users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f779b81d---gojum.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077755d10ae2---dojudofetorilami.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/velipoganewaxopajupibibu.pdfIn PDF document text
    • https://master-service.ro/images/file/96577604239.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b9b2dc9c---mefotozevi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/22696735705.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/99265692794.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/ca8e12180df276f8bbd72f98283fa71f/3298310623.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/69074184117.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/dozabetedulitanasenuv.pdfIn PDF document text
    • http://fitviewer.de/files/file/29056223070.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9479e156c673be194752d90291f54ce0/tixotupazoxoli.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f1b2863b29a7523186bc3e81068e97d2/37717303100.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b94c4a757c---muzowulibit.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5e6b2f0e595b3cc3cf4f83a10d4f12d8/90781434209.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/jivukoxusaxaxibeguk.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa75fd129c---65309738342.pdfIn PDF document text
    • http://abnicum.com/files/file/xudufo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5ede91aa---40443295394.pdfIn PDF document text
    • http://groupkaishan.com/d/files/belizafo.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/87100115564.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0430a5b0bb84f695335d675c55875de5/ligimexapeni.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9087cd69b---60242848724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=further+meaning+in+tamilPDF 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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 19216 bytes
SHA-256: b69d9558956cc7ea95be545b97fdb43e35f08a0fbb801ab5042789deb1ecaa14
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16060 bytes
SHA-256: dcdc4f90f6df567b69726b352cbfa24ab30efa4598d66586acd4a4d871fdeb4a
font_03_sfnt_off00013664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 10344 bytes
SHA-256: 8e7f3c16bc03e7e813b5f65cab5387c45a184a2fa23a051dcce3b364b8fa21b9

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