Malicious PDF — malware analysis report

Static analysis result for SHA-256 763713d5ccf5ccb5…

MALICIOUS

PDF

94.2 KB Created: 2021-07-03 19:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0249475465379ec68b4afc113a946982 SHA-1: b9e1b50ef6badcfafd1546469c6ae05774730889 SHA-256: 763713d5ccf5ccb56b610405c38e63dc948b64b3ca22c5f62e974221f2e1f618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gulfcoolcontracting.com/uploads/userfiles/file/file/dadosedulasewemekexojuwi.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e0b3b08---rodadoziwolonoxakufiluk.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/ruwabuterakajotebopid.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ff68b4f73073208c1206ff845505031f/79289600167.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bb933426ac4e73a30ec456971c2ab362/33742209843.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f86a6d966f6cd862f528250758702790/sozemumoxaritenebuwopa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94588509289.pdfIn PDF document text
    • http://sam-global.info/files/file/kekuwesabuzumudobutom.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a1cb48d6cc73fd68845781e9c4224c94/nebebamutuvopirubev.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096089486b06---84071176054.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/4459471540.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/38f0e9lm422s54ujse8jbjrb53/48653853902.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///pazeferebeboxepelafira.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90298984b---42166130088.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/26958122761.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/08o5cikq9de6rdedvl1lm050ml/35047272988.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca57e85d32873ad3974c8e81202e8870/6967695876.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c36806dde8537dfdef72b72fff38dfc/22058134774.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/105a282cadfc017a0527e7b006230cbd/38845665042.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zanupexaforaj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a371060a98---38146730412.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rmeo9m90mhsot03ldrp663f70h/16543790983.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/upo3rdvv0crkn7jc907o2u920h/napixirokuwim.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aojme29v29v211gpotmkh1hj2d/mobobitezesilamigerewet.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10980557701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=victor+hugo+the+man+who+laughs+pdfPDF 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_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 22964 bytes
SHA-256: 83dff34154a536c9fd04bda77d8313717ab7eada632e52d13f6d538023e51689
font_01_sfnt_off0001379d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB4 11220 bytes
SHA-256: 3287994792d6b3f0a649e69d9c454512d83e4974ae0a41055f02a814b5ccef17