Malicious PDF — malware analysis report

Static analysis result for SHA-256 772743995bb80a48…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 12:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc3b8eaa585d233cff9105aa6118b5c8 SHA-1: 761bb85f3dc932e2adf0704d97c007c3634602d0 SHA-256: 772743995bb80a4871bd93ca7326973f99f2730b343c51b95867569c6561ce4d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=difference+between+null+hypothesis+and+alternative+hypothesis+with+examples+pdf PDF link annotation
    • http://dogninja.com/userfiles/files/gidobabifep.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6vonphaod3ngantj127n9s4rk3/6712417731.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/eca09d1b6063326432031b28cbf96f27/mekevurese.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/127b9da7758030b533a4827767b7a3ca/gokajebalimaxanivuforu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4ae87e384dbf5430ef66a0fd225d8315/14805391154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c7381f8e---58890157585.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g0ndatngd3lk53l6lskdomhim8/99316259362.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/xezoxubosuxibesijin.pdfIn PDF document text
    • https://laser123.com/geektic/files/98959311931.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/jaxuxutopufatubakebof.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/937f005be35c5fc33ce81c9c590432ae/76076354195.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/6683423083.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zegafiramixepumig.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gogupojarirukedusafo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5603de01bc7b9e822bbcca9b3657422a/44295486718.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/kulepanogixob.pdfIn PDF document text
    • http://philipsphotographystudio.com/70033256294.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf096639c---73590882541.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/69461730729.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/60230691509.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d596bf3e505f9761dbb91974b4771a25/47363134425.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/pabosasujinedimubonol.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/gamiporaxaduwigo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/gofofojuregajirodolojapu.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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 19292 bytes
SHA-256: 3e3a6493a61e8eeda73c44a77049bf55674b6fd824ef15be8735cd5c50efd46a
font_01_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 11496 bytes
SHA-256: 5793a0e6b0604c13e6096db88267b0e89bc1d17ce2e9aa06895711ba45d35b4d
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1