Malicious PDF — malware analysis report

Static analysis result for SHA-256 293dcef7ce4650e2…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8c1caf5e8aceffe47e59f829ca7376b SHA-1: 56c5c2cd24c02bf27d215d3ae5076b8f5f79a5ab SHA-256: 293dcef7ce4650e2d1f82997640f0f433ea1a9925ed0b81fc573b1df719a6dd0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fe97e2e1---riselexiwerujizigixumod.pdf, are likely part of this distribution scheme.

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://accesoriosalmayor.com/images/userfiles/file/65863971445.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b4b80b5719357dd63bd44f53f97a623a/leseweluvesataxife.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b44925b72---letopuzidem.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/44089545222.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/v6druev1tk538ekuv3n87um59n/91440820199.pdf
    • http://tv-sat.cz/userfiles/file/rojugibilebipe.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98510c55a---sewelukuxibileze.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7365cb76---biraranaluvosuxejow.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fe97e2e1---riselexiwerujizigixumod.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/xusapekebosozorugida.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7355cc3532---kugubopigu.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a629bb81900---pojeravotejujir.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f10e1df6314d70005d4c8d7109f2b528/14780903152.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b58dc19e19dc57c9d09fc6a85635a440/43699859911.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087841059088---67340652098.pdf
    • http://ecohouse-lab.com/userfiles/file/69867132167.pdf
    • https://aviatroglo.fr/IMG/file/41945364472.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/46564249460.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7f757f56---84418172308.pdf
    • https://by-express.com/upfiles/editor/files/durewoteroben.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/legurinopasur.pdf
    • http://unesco-mediain.cz/fckfiles/file/99511416480.pdf
    • https://tramtron.vn/uploads/files/files/95417898182.pdf
    • https://bevelec.com/bevelec/dossierMois/file/dariboxiwujed.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=skyrim+strongest+health+potion
    • 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_off0000f650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
font_01_sfnt_off00010e67.bin
8ae593255e18811a1adf2746ed624eef5e94f0b96dfa3d8acb0799ff522f0982
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10980 bytes
font_02_sfnt_off000127b7.bin
4ed7b4c3058d079f0133738eb189e393c9de8cf6511cfa8ebc4b06e80380cf30
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 17736 bytes