Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f1da4c571527f4…

MALICIOUS

PDF

79.9 KB Created: 2021-06-29 06:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e05e1debe37fb76e8629d3c831f76f1e SHA-1: a9dde73944cd841188ffa6692a49f53fa39fb369 SHA-256: a6f1da4c571527f41d7cf9798c6075d1d927d68becc507b93146db0b627e5955
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 WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d7326bafb30b320ec2b819fa2eaf214c/83977181202.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dd712bb---faxelalu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c9432508fc6875821e1bfd0c6056674/pabibikazawamekikujareva.pdf
    • http://baaningdoi.com/file_media/file_image/file/rosoj.pdf
    • http://asja-doll.ru/userfiles/file/rafomejozijaluzivusagode.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c426be1a36d2b8065c3032c740b22338/61868056636.pdf
    • http://szrealty.net/uploadpic/2021-6/file/2021060521423473499.pdf
    • https://zegabilisim.com/calisma2/files/uploads/mitivubepisirasusajetusix.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/92273570577.pdf
    • https://noithatkuongthinh.com/uploads/files/50124257745.pdf
    • https://pet-fashion.ro/mm/file/vusawazatasenalivurip.pdf
    • http://verduciautodemolizioni.it/userfiles/file/79344312159.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/4848772834.pdf
    • http://abpaluso.com/upload/file/10885849834.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f0e2f8317312e5dedeee70fe3882e8e5/toluga.pdf
    • http://bukharasuwanee.com/sites/default/files/file/13423469635.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c528570e---daxozamizudeximoziz.pdf
    • http://frezerovka.by/images/fxeditor/file/97496376929.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b671cca58f0---69810117376.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773dd30f533---28335889623.pdf
    • https://blindnow.com/userfiles/file/9915118944.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a9dac9095cefe1ff214fe1d0efc31767/15817227397.pdf
    • http://fedime.org/imagenes/rizirajeke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=carrie+stevens+and+eric+carr
    • 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_off0000d4cb.bin
34e4701caf1facb1eac3343b16158e90f8a4aabc5c80621bb4909103f6921f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 17956 bytes
font_01_sfnt_off00010310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
font_02_sfnt_off00011b27.bin
aca1240f63d146bfff673883b625c956fced7fb4eb168e0dba4c8032d0d25c3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 10292 bytes