Malicious PDF — malware analysis report

Static analysis result for SHA-256 07af54d4b2f45659…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 22:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2ccdc1bf3d3af08e06112202c32eb34 SHA-1: 3dd5750d5244acb47bd94da8fc4074f8281b3bbe SHA-256: 07af54d4b2f456591bf2513b5e66a5c34956fa50facfa5ea9b6cb7cd5bf91d0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7ee50a27679d3ca8cdcfacc134b9c6a1/dogewexoxogujetisafuxov.pdf In PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210707_49F38F7380C9CC0A.pdfIn PDF document text
    • http://teplospectr.ru/images/files/raxapotewusutojife.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8da842f65---gorot.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbcc1bc96e---96240604915.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00946d23bd6205ea3888acc2dc9b1a31/ganazawesepuf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e3bc693eb---jamisokapasidiwudumizit.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mo237tipcrr1kkh2logn60cej1/lajapifugolujorevorilos.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d17029873b73ae38a1f7ffbe7742bb2a/22072439590.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9262d6f281f240a61bbf00f7c7a06aba/tunuvonegujuxe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b67739818280565b3685db6e62fe6933/nujorer.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vbhfhp5gspfgnj10s8o7e8a1e0/67608034419.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vujuwogapefugani.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e305ea8a6---36431810484.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/61813311009.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/dimipimemow.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d183a528c5---93709728186.pdfIn PDF document text
    • http://riph.pl/userfiles/file/gusesibakejube.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/rufadakotidosijejado.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/38289694685.pdfIn PDF document text
    • http://lengthening-sldf.com/userfiles/file/49844867425.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0af14fb0ea5ddf63a0757f34ba9c49cd/81163070296.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d7403d9---3665448222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=zamzar+free+pdf+to+word+onlinePDF 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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 15040 bytes
SHA-256: f4d9e8d02da6f4009cd1fd5549d1dd90e92ab2d8fc10168add36dc3f3d5426b5
font_01_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10600 bytes
SHA-256: 38e2ee73526b0aa140ae17ff2cf70774660d8640d6cbc9b4415842ec0c1bcc57
font_02_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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