Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1b031085e1cc8a…

MALICIOUS

PDF

96.0 KB Created: 2021-07-08 07:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 033b33f2a934be138ceaa02216adf88d SHA-1: 173590a619c3a15f44fe8c91bffa3c4ed08f4eb3 SHA-256: 7a1b031085e1cc8a061418ff41169d3165983b54459f816279f25a01edcdbf94
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad20537dfc9---54830464276.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdc3cc12b---fidixubadijazokukexu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac20c9591---33457630498.pdf
    • http://muzeumostrowiec.pl/obrazy/file/98549456520.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d90f66eab9846fd6abbaee75717117f1/fugalimibibibokumawipuf.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/16370762868.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cd9c7865---54977570005.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/54765094700.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/75f5aca9097d7693928b336846e16f87/xazilarimiwizesavine.pdf
    • https://susta.vn/userfiles/file/gefizusiretot.pdf
    • https://alakharia.com/public_html/userfiles/file/jewuxejujosavomebukiv.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7320f237---23308877570.pdf
    • https://przyklejki.pl/userfiles/34545142100.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084e350de581---piwugubijenadilazalenap.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e986ef10---70505571244.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ea80fb82---lodeguwevibume.pdf
    • http://podlahypilat.cz/admin/file/dufadoxezu.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/nedew.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aeb33d5---jipejirojom.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/it0c1cin7ksvjdpuqm7m7ttfpd/xuguvigirojomunefadikux.pdf
    • http://fouladsazanco.com/Upload/file/bozejoted.pdf
    • https://digireg.pl/upload/53365257624.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9edea4398---17163013386.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/85rso68f7c4c1updt9tqt9cqi0/23739462516.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chemical+stoichiometry+definition
    • 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_off000111ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16792 bytes
font_01_sfnt_off00012a05.bin
3659d4840ad4646b052d646f9f5fb1901ccf7dc7fc05f0ef1ab17894cb80f9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 10888 bytes
font_02_sfnt_off0001430f.bin
d16fa0a92df8f7f4cf168b940b2abdd9bb7fd9a46a5b9cbece4881a38f49a38e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1430F 18072 bytes