Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68687968c3f85a3…

MALICIOUS

PDF

91.5 KB Created: 2021-08-26 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23c0392270a2440212fd7a58dadb7e41 SHA-1: b39c942b69d8859e3e70153842262ad2430c869d SHA-256: d68687968c3f85a3364a4a72b70d16ccc3f913008521a5fbc1d7d40ce2aab19c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://studiotecnicomaglio.it/userfiles/files/49136160117.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a905af984c474c4a8b44616ef3c04399/4985203201.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/26035367477.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de48a0fc21---dikijefujipu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lgrum2r70rvli3bv4gr2kjfftd/difomapudumujaduvebi.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/13185084476.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tujopajudogape.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lamevusituxefarigelomi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nlddh7oa7geac182nl0tsvp3b6/kujekumelunakig.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/32171476541.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b512693clgoled4o837bu9ug32/gabes.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/zenuzakewelixijegepup.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/17892978919.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/larufaj.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73963697643.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e2891b9---86861922170.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/fipivebirisafoweke.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/998997544.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/lorasifiv.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/25369961930.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cab9143f758d33ff34b15f048dfa95e4/sodemebenotudanagin.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/41436456765.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/15ft83mgvnjbr7afghbaeucpr7/gebumenesajililiwoxitaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bollywood+movies+2019+onlinePDF link annotation
    • 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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16560 bytes
SHA-256: b10f613d6b146dd1515c097a8f565ac723a39548346640cf52d0121850e1826a
font_01_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 10832 bytes
SHA-256: 821eed81c979bcab58671785fc4023023ebb564c4a126da71b47f9acb2eeb184
font_02_sfnt_off00014db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1