Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab2b3f1b1abfefe…

MALICIOUS

PDF

94.7 KB Created: 2021-07-22 21:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9e402c66838182b169f7dd933d7995c SHA-1: 1ba7d9b2a2f4c9dccf057f8568fef625b43cbaf3 SHA-256: 0ab2b3f1b1abfefec8e4946eb9228fb4a93695ec02e83313e35d8824610204d8
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs and a link farm heuristic points towards an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8660f343fd05b818f9782790447f5ca/fujawoxijozazozoporagu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c91071ed68---84256539161.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/258ed549e07ed67b007ede6c90c6278e/jobijunu.pdf
    • http://francisfamilyreunion.net/clients/870293/File/58039178185.pdf
    • http://sacmacbook.net/userfiles/file/51646317542.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eadd71f8c---fuzozagukamov.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad15259bd---wupodeluvonajim.pdf
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/9949317110.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbaa7659d---bebabinagu.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c38a0f7b6cb6d98f32230c39d653a3ca/28085836022.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pe8ujlc4hqo1hlm76rveao115o/refezuwefoxajibaja.pdf
    • http://www.gonouvellezelande.com/files/5286935117.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfed865cd---benijolewuvapisuduvitefu.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/19307372824.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160950dace186c---75922424401.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0310aed7a---71559288897.pdf
    • http://fratellilongoni.com/userfiles/files/92868697417.pdf
    • https://service-panev.com/userfiles/94150122941.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1f6c7e87---86980598468.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r5paeo9fvvfdg8iqmme3q270/vinunu.pdf
    • http://podhoru.cz/userfiles/file/84662023146.pdf
    • http://c2r-auto.com/uploadfiles/file/2021061207223573499.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/xisuwokunigotesebinama.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/87600424040b75c8f371262c781903ec/riforerumikejajixi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=where+are+you+now+you+are+the+shadow+of+my+life
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d64.bin
3e96ad2ee44f8a476803b5843172101f9a1adb9a7cb916bfab155b590afef65d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10912 bytes
font_01_sfnt_off00012681.bin
77a196a6427cead06d2c42f95057e9665feb70cd6232ffd474a50c8481aa10db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 17508 bytes
font_02_sfnt_off00015460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15460 16792 bytes