Malicious PDF — malware analysis report

Static analysis result for SHA-256 f253091b885708b9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 09:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b662419fb7f6e79497ff5e396340a1af SHA-1: d0926322f4a4c7e4288c13f4361580382b934a19 SHA-256: f253091b885708b9c4ff86387ee4aeaec5fd57d591f7be477e3757eb18d7dea2
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to malicious content or phishing pages, exploiting them through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

Heuristics 5

  • 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
  • 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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960de3b14---kepog.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610460d6d0f87---55612877739.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/32868054253.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef77e5153---notejorunebavezetuximu.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/97958627443.pdfIn PDF document text
    • http://fittbikese.hu/files/file/37989895210.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nonevir.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e19802f1c81---zukofimo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/joletimukojexukurik.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/410907c1ab30e08b1a2d20f2d58af0e5/basefovexasabukodikew.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/52313316341.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gunamaxaluvegibinuja.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/42983335514.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e77c9965f09---82944447485.pdfIn PDF document text
    • http://change4best.ru/upload/file/rivefazanirarejapubiwav.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/vaxudubu.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/1716456565.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0dc5a366b---gomonojaruzorilurikadaw.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e5069ea8---87807503936.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/93550143755.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a2eb9e470c042725c6b2e68c9f5273a0/lopopisujo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/xawamowasobazak.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f7b79ec---vekuwites.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jowafiwezemetu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/5119446704.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/38184333519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ubuntu+server+terminal+commands+pdfPDF link annotation
    • 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 11096 bytes
SHA-256: 1763afd6f8105b625d2be540228dcf79468273008d7121f071bfdeccc820f1e2
font_02_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 18552 bytes
SHA-256: 9c5087e854ff644e53cb1021ac1d261b53c43a0ca0bf4c33223dde42511b5d26