Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d04fedd3d030b7e…

MALICIOUS

PDF

86.0 KB Created: 2021-08-24 23:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46a1a1378ab84c01410b5adefa8dcf7b SHA-1: 68b3bee9730ed0ed06373422d483d4ed0fd33b5e SHA-256: 8d04fedd3d030b7e006741c27fb48ccbbafb95a323add3544f25b86fe4c1efa2
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple unknown URLs suggests a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/vevugepubokakimanab.pdf In PDF document text
    • http://cropscipublisher.com/files/upfiles/file/widalamigodawujebofemezup.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608767f3a53d7---53925688241.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04edb89bad11e439189d8c2ce5b6f969/xosefiwuxabagome.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e0b9dee5d4b---biful.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/panosalagigopiridibijipi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3a01d457---78893179332.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qti8pssfemaqi5g3nsl92bg3f0/25442362950.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/guwefosijozafaxepubez.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7m4hcgbivvl446chkqdg4mmccp/winepupiniwiwozaza.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095604fb2e33---zedewar.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/42163926d37060b94062b679bd5ba4ce/gusim.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/64621687669.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/86231748120.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/61057434225.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/4796483371.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/38010887820.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jigafekerut.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/67089868973.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ek4cjvdh12ht9442o11nu3kdkn/kigaxi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088701be0467---49993169564.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bkij3g6tjggloqbc7kjb89rfi2/xuzekitin.pdfIn PDF document text
    • https://bnovum.hu/downloads/46301103977.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/mabodowevemi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/35498419431.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/nujaworulowewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+argentinian+soccer+playersPDF 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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 17576 bytes
SHA-256: 3e10f41a286559f77ad1c788bfd890584053a2ff1d45fcaf321f6d129462fedf
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 10716 bytes
SHA-256: 11f3cc9fc5c66a39badeddc1806c1e01f99b0a734f7a133ceb89e5dc0c98c9cf
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1