Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33f7ab80845f756…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 08:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 260f3378330bc5cb981d0794c2530b64 SHA-1: 9250b53a244fc53919bea13142f0f3597fb150f9 SHA-256: a33f7ab80845f756c46ffa948b8c258bf58b5cd358efce29601d0afa15016276
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to exploit users, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=instagram+followers+app+unlimited+coins PDF link annotation
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v2c42krq2bpd97omrp0v9c1ee5/87505550667.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/54686404658.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95b95cd1---42474191148.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9af8ad1e---diduranijogineresume.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/malininas.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df49c7c7ec---14590314935.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72478777988.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e37fe2e2e62936ffae0a126726fc0a98/39183275713.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083175bdd5b6---fokavebibowo.pdfIn PDF document text
    • http://www.asslar.de/downloads/porojixezejususizavabov.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2eb1ad5058945e59ba7399fa0bffd762/juturiwomoloreraso.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31761189604.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/tpgdn50lvgvc3o53qhf3vnt1v6/pefarepugo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c2599236f3a8b883c801aa8015bb29a/puwajepupakodojezagifuv.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/ruzuv.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/zagisudemedupij.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/dujazaloke.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/73695917873.pdfIn PDF document text
    • http://novichiha.ru/pic/file/98022319725.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f644713062---34599253481.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/03klnumt1ng32ghj753vst2nr6/98542597441.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/dunesato.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/93069822052.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/91529589033.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1753d4855---vemadenejivujex.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16828 bytes
SHA-256: 8c2fbca4661536e34154c36f1b2f7ce4241955ae69bdcba094b9737aa6465724
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 11100 bytes
SHA-256: d0edbe86a1a5884e1f494be78f3555fdb6b2989db0fc9d1512ebea0ddd568677

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