Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca94f7a7ec58b7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 07:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfe3f26c2694d9512b4215559b04fd27 SHA-1: 9b95c8c07c7f94844ae0f67019d4d45bbdae8452 SHA-256: bfca94f7a7ec58b74f945233208cfae06a148a29168fbbee2cd40d7baa4bb51d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chaukitchen.com/uploads/files/5134187050.pdf In PDF document text
    • http://pokebarslo.com/uploads/files/kotelumadiwenodopapuro.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/30525482212.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kolukalewegabujemus.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/23a551aa7543caf14fbfa1746e0c3e93/wilagazetuneg.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/68220145718.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/finutoropa.pdfIn PDF document text
    • http://yepuco.com/uploads/files/83397166574.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxatuvolodonojotarojirob.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xonidisolazu.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/28037907378.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/fakimakat.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/38133988614.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/57764779858.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa36d72e00---dojopomomajaxarev.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307958c29a7---64163515315.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/vewoxovituzifuxifuvaj.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/niwovugod.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/jajoxoru.pdfIn PDF document text
    • https://msiutilities.net/documents/xidoz.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/tunuvela.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/64739055353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+high+society+online+freePDF 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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 17844 bytes
SHA-256: 53d9de412da38d2f792d5c95565b94760d624f846edc48a867ef3ed8063cf2cc
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10720 bytes
SHA-256: b20dd838bef653ca3c42c8dec949775e4a6040d43dcf64a11566f8ca6512814a