Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2062b6c9b09d645…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89856b4f715fece7294fcc864275b868 SHA-1: 0248b388f12cfe8883579089ed286494d8e698ca SHA-256: b2062b6c9b09d6459c35da66397d77620fb3195a50fa5a7c0839765ae46bd28d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and the 'utm_term_redirector=True' flag further support the link farm hypothesis, likely used for SEO manipulation or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3b9fe4e396bffab41eba795d2d03cb9a/xigiramob.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c84871f0---88309520659.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/fabilefokux.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8c36b9b8---xewafefisul.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zolilewa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9a487b31---varezubusuxusedogani.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/buzipixiwexanibirim.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869da6d103e---fidesuxositibanut.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/panane.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/7155112684.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91ee15553d---31974737387.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/18906981295.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fadodexojo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/bavixinovagumalejir.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/poronupige.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/depiwu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160724a467e407---pijemutilib.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/76817160980.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ioh7iesafjhfkmrf87jta2f8ul/38565556439.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed91d909---85737178944.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/rigej.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qlpeed0ibm4aecfoplf81onp4c/34012332441.pdfIn PDF document text
    • https://rcot.org/userfiles/file/41992300032.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0738640cd8---jamiwipedapurer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=samsung+galaxy+watch+46mm+silver+manualPDF 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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 17628 bytes
SHA-256: 4e12c040a55d36598d639c563c74b180cbef64d2e744e15ca7e0781ff4f1282e
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11348 bytes
SHA-256: 84622de40d8a770058b8e68ff3a315c19c732811df5e7e6d81f9fee5b90bf55a
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1