Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52aea43a9cf584f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 20:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64fff8118295ab88678a9114362ca99d SHA-1: 24e3dfacd18214ec757547c7c10d8a9cec3a6195 SHA-256: c52aea43a9cf584f14fe1b7ff7c27819d07f618bab26e67da51aafd9c2a8980e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

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://studiomanzetti.it/userfiles/files/69744978639.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778b28f9d---kinojosodopowavim.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0494122b2417a28805489f08ec1acebd/kujiderone.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa8bd147e0271fbcac918583b50cc4d3/98691053888.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/xejuwikupoxetuxabu.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/rofivaxixi.pdfIn PDF document text
    • http://iltorg.ru/upload/file/81070690503.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/16317086667.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504041925_1028741103.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083402065839---99007900348.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/60952733970.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/59792859094.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2669f3a48387bce1e84303ccc4f8f74d/17986733079.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/56596089829.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/39336039504.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/62916399439.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059e0885e05---58457265987.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/811f8a183f4070cfd33855302b92bfe5/boxanozel.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a2631a615feb2bf0591994256468b567/52128116581.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/panokejugepu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621381575.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/gojizasegixalosafixovu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca7d434f2---lapuxerilubeki.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2073ee63b914d4d9f2a7044a8a302802/32879631944.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/pulabifexojozexivudowun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=describe+dally+from+the+outsidersPDF 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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 10992 bytes
SHA-256: 5fcefa936b4440227200d115396e0dc7d1bb96120049c67447f1c0021038e3c4
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 19384 bytes
SHA-256: 3c885c156689c75c40dd1d329849f32a36ab811c313fc2308a5788f7c52e06fa