Malicious PDF — malware analysis report

Static analysis result for SHA-256 013054cde22c6633…

MALICIOUS

PDF

83.9 KB Created: 2021-08-16 13:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29d2d9368cd9d789056fc8879d784057 SHA-1: 64b20fa3777fd6469445bae1daac292d3a6abe15 SHA-256: 013054cde22c663340d90c4ff2883d09b7df913fc66646f8bab0f775a7ce3176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://ehlibeytalimleri.com/resimler/files/nasiximevume.pdf In PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210717_F5E8AF887BE57C0A.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/56412589905.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55488abdd5---rijilokapisujutisolugezub.pdfIn PDF document text
    • http://mastervin.ru/files/file/rawavuvuvifewenonewapug.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792127b2730---42238959804.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/wijaxetopemejalamokej.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pusufimowosoxakumububade.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/rawiluzow.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30263850582.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb5056c46---lapifitogesikufogega.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc898aa1a---potawolanokin.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/99739367985.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/libokubofepikapasiri.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kifunokomadedadekijase.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/7361378008.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/45846795.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/26738442629.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609018619543d---lusepefazavewiwegunewise.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0c302eef---43208804693.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/puzafatarese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+farm+lease+agreementPDF 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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16272 bytes
SHA-256: de01985947afb459280624dbcfc9811283c0e7883211bb793293bfa80dda9425
font_02_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 10636 bytes
SHA-256: 0d72c516fedac35b5cbb9058b5a4431e4357fb6b80e62720954d1ac38a75388c

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