Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862f98d8a3dacfc…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 01:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 926322be95e5ae147f0134334c86204b SHA-1: 96cee9f3a1c18ad2510063a6c0b7c449af235dc7 SHA-256: f862f98d8a3dacfc13f3e95b29d54622eaf5e119db1db0e6dab39ec486f8b5fe
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9e70d49---kifafatabiwut.pdf
    • http://curry-box-deluxe.de/userfiles/file/93781066489.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/30oq8vv9m77su99soi77g8ig69/79022266258.pdf
    • http://hainescentreasia.com/images/file/rarepaxajes.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5280c851b---88014279262.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cf115f28086762d32c38f041414c8b71/82016557724.pdf
    • http://wsp.pl/userfiles/file/vifudemarokowawileravijum.pdf
    • http://dlt-nkp.com/fileupload//file/kopisezot.pdf
    • https://coil.hk/upload/files/lesemibosokubumu.pdf
    • https://peterdegendt.be/file/gavupe.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca00d1b5c31---71179241779.pdf
    • http://pension-erlkoenig.de/img/editor/file/taluwetibaregaj.pdf
    • http://www.thaiboat.net/image/upload/File/jegixidatimefin.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073662323781---84169511906.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35e0d39cc4081ff598101e4592bc4dc2/xubedotebepo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/q35g503virvr2n8ec8mdlofv3t/42360153005.pdf
    • http://stark-tools.ru/images/uploaded/patexetolonebemaper.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/77475671399.pdf
    • https://readandenjoy.ae/userfiles/files/sigejovitigoraludit.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60B5926DCCD62.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5470881d8b75f1ea7f3fb34fc23e45a7/24081468769.pdf
    • http://dorp.pl/userfiles/files/28467198092.pdf
    • http://sns.hu/_user/file/lafatanorosaj.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c538f168388---mutepapexozozug.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/70f92972d2310cb60ffcd328986b3450/wunurezapej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=give+me+an+example+of+a+stanza
    • 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_off0000f27c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 16792 bytes
font_01_sfnt_off00010a8e.bin
7675f9af76473aaba2370497e65261d83657c396118ec397938ddc1b4431d16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17568 bytes
font_02_sfnt_off0001386e.bin
2338a049de726cce8f3a7cc158174f489c296e6bedf28499e2da22ac9826be31
pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 10684 bytes