Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea981e993deff0a…

MALICIOUS

PDF

90.4 KB Created: 2021-06-30 01:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f35dac68a786de2359e2cc6f5b3a105 SHA-1: 5b9fc9177b039af813722273b916ce5ab6b494a4 SHA-256: 2ea981e993deff0a161b93514a96f4db9814a3536ca4b33e51208f741643b961
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=damien+hirst+treasures+from+the+wreck+of+the+unbelievable PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d6d9052e---14971815635.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0375f9f578861b132efb18b5ea375bfa/86983372969.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/zuwoxiwototov.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/48116139122.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748dbf3e1a8---34440290321.pdfIn PDF document text
    • http://derma-dts.de/files/file/84746660964.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c3cd0fb5---napoxopexawuj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ffe4e217d54258e1b9b715812abece71/85437734719.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/tiguwibazefosese.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/62826236210.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/51990876559.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c5egrslb6p7orcg0e5grfi9eb7/14851452446.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/954c43680b9a359179ecb52fbb400a0e/65462893181.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/nibarugesajemapu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607096c66d26e---gupiz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0c75cd112fb3c256a0aa7f59c48eb914/roputokomuvigupegak.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a456ef99de9---nivazopawir.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729804418cf---25843164839.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/10412594171.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vadulijukeronajig.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nokasomomasu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9adf92e382---98833168201.pdfPDF link annotation
    • https://eobliecky.sk/userfiles/file/62152540076.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b88bbfa5743363414f382b5fddc3f021/bolomitug.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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 18588 bytes
SHA-256: 94990c9d72db681a9e0b7084d32b5a198e1ec27d7f45fca55379813abc2e7560
font_01_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 11084 bytes
SHA-256: 828c84ef577e4291b7318b425cd9825500acf9cbbdf42e31ef09939278ab7885
font_02_sfnt_off0001438f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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