Malicious PDF — malware analysis report

Static analysis result for SHA-256 9684791d2c51cc26…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c57e58e09b642450140a15b43e8d921 SHA-1: dd0b2f39719dd381f732f7e94ffe347fcd915ea5 SHA-256: 9684791d2c51cc26bd5ead3b5db72c0d5bff97e9000a3c16c6ffb0dfe35f4af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/be7ef938aebffe907cd717d658d4de3f/gimugutufakuwivumezerepal.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/53415434949.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/cf8055b59e475df0383d74f43523084d/61969815812.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0240b01442437ddfa11916b30b79a87b/jerafejizabuxokile.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/27540368395.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/30989921113.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1e2dba5e945481b98b9e77b46a458465/pegamadomonasemodofuduna.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dd9e2414---63753356132.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb4ad34f8e0a078f7611faa4a730efb4/94856697741.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d485a69f2b6cfff8d736e2a11e8f1cd/wukolifopemejolo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dopalitabinibotedobo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f9643873b28e5e03c3c5b31cae3d995f/358007803.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qb756ukbhn301i16f3vvdc959a/38651849173.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced0113ac5---60918077217.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/31663083556.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/65jb46hgql11t9qhjk69ifr3sq/sidenegazafepitip.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/677097dc136489104d014ba97b159e81/14004940737.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1622657821gomobitodom.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b5273a6a---nivifodesoluvoni.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/937a69377b171e1fbaf58c92a9041d0c/setikowalogesupesidezuje.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2b6dcfe54115d03dd861a78fe758aa85/77026243372.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609736b6a4c42---3728519868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=open+pollinated+seeds+meansPDF 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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10480 bytes
SHA-256: 8c3d8aee7d066ac3b8302deb719a6d412b9e373220cd7b372957ae21b1b8fec3
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17164 bytes
SHA-256: 2c10b859a462e3a257766cfbc5cdc5a7d8a23d51c9bdf095628037880f84a17b
font_02_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1