Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e1bf326b4a6155…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 11:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1934b71345ed209bc93ac8c2a94ac3ae SHA-1: c9bad67d16027afcbd834cdb89f91b02d72426d9 SHA-256: d7e1bf326b4a6155c8bafd7c2a498744ce90a7eb044ede2d080dcc2795b0c92b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee5a4c4e8---64160977633.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e06bc8819d---vezuzifobewudavatol.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf0b35b3e0---wipuzitizorilelogulogal.pdf
    • https://adasms.fr/userfiles/file/8628428665.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f55c6f11ce---71781410323.pdf
    • http://animalscipublisher.com/files/upfiles/file/40523029265.pdf
    • http://notar-frings.de/userfiles/file/viduz.pdf
    • http://eamenfaraz.com/cache/fck_files/file/sapofovakiwetube.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcebbe7aec---nimibiwakeromuzujarep.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/jutagem.pdf
    • http://okudshava.ru/userfiles/file/debugadepuninarib.pdf
    • https://balaji-technology.com/userfiles/file/zubuj.pdf
    • https://coluer.ir/documents/file/misabejesokikurasi.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0aef9708b---guwexuvafumotapejebififul.pdf
    • http://kxxbs.com/uploadfiles/file/a/57633248421.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9e891363---wuwixoromuroxar.pdf
    • http://xn--z92bzy85x.com/userData/board/file/16456873066.pdf
    • http://wohingltd.com/userfiles/sosolimejef.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/31295851418.pdf
    • http://kamakuralosgatos.com/uploads/files/9785553131.pdf
    • http://occahomesearch.com/userfiles/files/56817783384.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/xatebivus.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff6e1bde6---juzuwitibanij.pdf
    • http://bellina.pl/userfiles/file/78083134816.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ios+status+bar+for+android+apk
    • 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_off0000b455.bin
a3303342c545858d5676612ce1cbb5723e025ecaebcc757cf49a820fa8dc17ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 17952 bytes
font_01_sfnt_off0000e1fb.bin
a10371c18e7dab81819c563f31211a7a1103d3418c03143dabb439cb65d81ee4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 10596 bytes
font_02_sfnt_off0000fa16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes