Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e7b9684c88d689…

MALICIOUS

PDF

89.2 KB Created: 2021-07-07 16:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c3344a23859403a3ecf4cac1491c2c4 SHA-1: 1035df5d028be7db5cc6a66ea5183bd62c7aa91e SHA-256: b2e7b9684c88d689c065678cebf91f69d5c859a40c94f707eb579ae82679a2df
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The content and structure strongly indicate an advance-fee scam, likely luring victims with promises of prizes or funds and requiring them to download further malicious content. The numerous embedded URLs point to compromised websites used to host malicious files, suggesting a distribution network for this scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crewmak.ru/uplcv?utm_term=one+riyal+is+equal+to+indian+rupees PDF link annotation
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f5a4613d6ead9ec2f28cce4ab42d7f2c/juxebajo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083072bb6325---nisokejegekitupala.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ke7l64s5e7an1pfomql77jf8qk/30265766638.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xekakezobidipexoguvagar.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2dfaaa74---jijotuma.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/fasemiwerubiwutumuwik.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/73662582503.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/basevemoxur.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/77471362519.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b41c53da---tozafiwukovabijakajimogaf.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lebesaporo.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210627_3b7c8.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6a6da03c---zupebomidas.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c10315e3f0d---81181109889.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/9082209686.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ef3dc0277---35805185459.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa92033da---gululemesixe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mibivokuwujewagofomisezok.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pamasukobodusizabu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0e3cf49d99fe17905b6192ad5ba92b26/31631249712.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/ruxaluraxaw.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/1389319716.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f499ecdc---2298910725.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10768 bytes
SHA-256: a82e99cb9024fdb83cdab38bff4570d0f1bb1fa723cc946b6596a2c76481209e
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 16304 bytes
SHA-256: 727b761dd601f14e8bd22d0a41c491c9eab5829d8e28bf0500481f57196f18d2
font_03_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 17348 bytes
SHA-256: 27a541b9c3703aaa5ea4389d9282bf2e903986d58b7aaf00e2ae44f189dfa81a