Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a12bc2da38050a1…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 10:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66e3a72002dd410bad7813ac8990b7d5 SHA-1: 4b415ebb67b50446f70136c098252ecb714cfd59 SHA-256: 3a12bc2da38050a10df03cf779aafd7b248ad55fa19d3dc2cb982502ce3fbadf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://miguktour.com/FileData/ckfinder/files/20210816_84D37A6D099B3B44.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5f3ad677---5564766188.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e08dcb68a---roworisuke.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb32ca61c---kixetawodulamo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d73f2602c---gemikupilafakeg.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e92c0d671f0e6a24615065aa1cba81ea/70247221940.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/84295224089.pdfIn PDF document text
    • http://zuche0551.com/upload/file/47663052392.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/xaboxexuw.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-14/20210814032010709153.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8fd6d3651ace1147da922acec8451829/notam.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/55eed3117a34060c6e32644825118440/42528844578.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/besomoroxojim.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609103e29bd71---mewiwikunile.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/98120749637.pdfIn PDF document text
    • https://noddy.nu/images/file/35128773729.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xokezumonibo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c874e2bd2dc---nedekatanizo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c082969c6---jawusulaxikogegalijuf.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/rulovor.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kuvugedufipo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/68364350179.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/72593641066.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/45786906640.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/32b425d47a63323690f76c9d57e371e1/64828200911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+plancha+de+vapor+osterPDF 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_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10676 bytes
SHA-256: 8cf3f2a5ede14c2b94be4c5c49d513eee1276824ef9558bdb16e1bcb8068bd32
font_01_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 20036 bytes
SHA-256: 674ca9fc1953c49e34f4291a6ed583afe1f074071bd3adcd8252ca5ac235dca0
font_02_sfnt_off000153b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1