Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d519fa6b3c696d6…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 09:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a659784429434dd010dfa31a5314d065 SHA-1: 27405f7ccc6c8d0f1563a80a2353329948b93d57 SHA-256: 2d519fa6b3c696d615b37d020fba725c84c521ae818fc95018526e65f02ec163
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose, which is likely to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://studiovalentini.eu/userfiles/files/98859730916.pdf In PDF document text
    • https://vyrukrc.lt/userfiles/file/36002733802.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/dekujukojosilurade.pdfIn PDF document text
    • https://actor-conseil.com/files/file/59937645373.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210527_945DDFB6B9F2CFB7.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aba1c3b7fee7007564e1282fc2ff710b/95917807006.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/24820129845.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcbec3e07---memixi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a748c803f---36043610473.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/sevakakuvata.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ff2c68a7---62496985791.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/1328924657.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe38976c7d---52838245637.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e87e06bbd3ba5d10d71d4ad3cab2250c/pokomemalikipopel.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/48113383762.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/rapekosewese.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3b88983b---50050690597.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/70901701981.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf42803200---kugilafoporojisuna.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608129dd5005f---gufuzadukaweresol.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462d438f91---zigokuvoxetatafopopube.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/vobewad.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/fulamafonazag.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/abuhelcqtqhdop4qegosj2n0s3/bizelekiluzapepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sioux+falls+indian+reservationPDF 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_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 17528 bytes
SHA-256: 6200d0d8193ad0b8cad4687505bb6f40675177e941b837a3d934b53659db6a1e
font_01_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 10688 bytes
SHA-256: c612a44520b6f0f7f33ebfafbb21a4438cd1b42199022cb0984a208202511faf
font_02_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1