Malicious PDF — malware analysis report

Static analysis result for SHA-256 374bcd0005f74499…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 10:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29bdb6f32cecea2e9174552b3d2344a6 SHA-1: 3df92ddd0260cddc75320bf4e5c0a87d19c92276 SHA-256: 374bcd0005f7449949193ff9b115228ca2a194a910df7d3936cc6d20b002ce80
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farms, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and link farm structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=voice+activated+camera+app+android PDF link annotation
    • http://tiramisu-o.com/yamituki-n/uploads/files/femovuxexikevowiroxulevi.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/1735743248.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/pewaxagujireguw.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/duwumep.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rotuvatujimonobadufezubob.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dehg15ko45i98fivnvnol4sapm/vujowafaxegeta.pdfIn PDF document text
    • http://e-district.org/userfiles/file/20929355556.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/005f3e6adab0e4d134f32bb97428e4da/wofebisibiwisebososatexov.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/3468054183.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/74735587363.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75498743362.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/98120199084.pdfIn PDF document text
    • http://sbcnepal.com/images/file/vesoxawasulaneru.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/47676455579.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/42371624100.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qictrpegjdj3ihsvk0duv4valu/bomosepilutod.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439c33e5d71---49431488888.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a01da8f---50828091180.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/nimusenij.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/rewonofatinuzajokiju.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/4022450482.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/titanaxexutexewu.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/rusixejuvupodarolozup.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/50588413676.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429f3b743dd---33337739020.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b1525ce44426a0b8eacb5457be0f5947/22606497012.pdfIn PDF document text
    • 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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 19724 bytes
SHA-256: cd91778579db63cc883e16939f3d92e7310f11fef62d5dfdf91a195d06f8fd28
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 10496 bytes
SHA-256: 27c0cec74ae70a9a1f26b47257a20178164d30dba76df3185732a34eaba78031
font_02_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1