Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4ae0d7f9497055…

MALICIOUS

PDF

123.6 KB Created: 2021-07-19 10:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38b53e0ff84aa7dbea9a351c22ed8250 SHA-1: 4a44b6d0cdfcbef50c9d26b6daceaec51792bf40 SHA-256: bf4ae0d7f949705545d5a1879446e9636af410d1c7568a93e73faf8bf7f77cb9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many links pointing to compromised WordPress upload directories. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting malicious content on potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9098

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 http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fnitgb9t6fprje401gstrie3o2/zufukagujikudalujawe.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2a3229dd67dea9430c12c28cf16dcfca/15284181848.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fb4cf0fa5b8b9d665a6e1edf5fe98e01/febilojivoposapixuw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53c78f6f---tebopisa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2tni0u1sdacmjle9nmkrgtheci/majuzenedovalelokudenipi.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fowikodakuwidabuxobopavek.pdfIn PDF document text
    • https://renault-service.com/userfiles/xijelajonelizifimezosena.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nvqn71g6qk920k8uuoc69roo41/rezarop.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/pazasetedezagidaxuwafexa.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jixuduzogawagasexenevexov.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/afb9944fc5c211c8684f6b7c13eb2fa0/bivuzokupevudugodow.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/vatujafiwud.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d87a80a7---58883493571.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b64a42ffc---xegovasuzolaper.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/13961299935.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/mukaligubad.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/rujarimurafojuwimugabotu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c7654bd0---59722640424.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/12995520340.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/28000452008.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1978c0ae---buladoponilakuku.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/53519952901.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/niluto.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dadopipodogajimot.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/fibazaxeriniji.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/lubuvesimopelenokut.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lepegemusita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nausicaa+of+the+valley+of+the+wind+watch+freePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5F 16160 bytes
SHA-256: 0de48d09b0091e2dcca1524f119562a2650f4f0070c1ddb91a42211a810a88bd
font_01_sfnt_off000160ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EC 10916 bytes
SHA-256: 3769630a304694ef6b67540f16ddf616c8933934d072524d8a4c2b0635075527
font_02_sfnt_off00017a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A39 20012 bytes
SHA-256: e77c920222ff606e7fbc6e73704e76ce2e85323ea104d329e3ea11a14a2568dd
font_03_sfnt_off0001adaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADAF 6648 bytes
SHA-256: afb7b7051a6cb68f0f441bb0cedf247b4b3c61ca78453fea7311e5cc5314439c
font_04_sfnt_off0001c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1