Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b488be3edd41309…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33235e73e2204ded957ec65afe6f2fc6 SHA-1: 10daeafb7ff391243524f9f7aebc9dc6e535cc01 SHA-256: 8b488be3edd41309294ec27036ac0e515da0f2e5a37fb3dba60c3fba5b321dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories hosting further PDF files. This behavior is indicative of a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=bosch+psm+100a+manual PDF link annotation
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/e2u1lb54j1bfm58vil748sj7he/56308984971.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce41aa10a1---44597724707.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/niwasisoguvedevumifofof.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/52120337583.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/suwavowe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1b4609ab---17116645801.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe8a69b1d4---53188736020.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/newovixuxekegopa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946fefa71a5---73956450737.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/3797177485.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/kogika.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/67682703406.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160836259a99d1---82224475245.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/xobofoxijemenur.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/62379734120.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd8549ff2---73811469390.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/15658380691.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/tusubewiposubugamip.pdfIn PDF document text
    • http://findplusltd.com/file/kalidije.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l3lh14bg4d45no7ju215tpvre3/sajidaranozavipozafo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0f557b8450af1c9ed98ea634ba5ed912/felivadelew.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jguint111al7logm85pjjori9p/mujisoratoramunex.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380199b2ef---zurulasadakawofo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe698c9d4d---41862617495.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 10544 bytes
SHA-256: 296a40bbd2f82830284b4dcad62c7b3010f447935211d0b3d660f68b5b0869a5
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 20980 bytes
SHA-256: a1d06e61d4e9074b493905944dde68b54a835ff33eb996a7ea3fc0076ba94111
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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