Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a5739f1ee5b37b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 05:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cf24283f74f01d64a11171ef7fa918b SHA-1: ad1549407e49bee26653c169278768f360080c41 SHA-256: f1a5739f1ee5b37bee6592d5a72627ac8abc54b42a097a61d889111ffbc1f617
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=everytime+i+stand+up+i+get+light+headed PDF link annotation
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160785d0434a4d---sizuvodekubebisirununep.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/sonid.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/tirutifibufug.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610320f5bffe2---88404420685.pdfIn PDF document text
    • http://allasclub.com/campannas/file/24131308438.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094367f0554c---16021804641.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/83556081539.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/772db180baac0cdbe40c2aa6d0d2ac3d/makizodowivufa.pdfIn PDF document text
    • https://jotelek.hu/files/file/rizam.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/91b7c3275e5ae61ffad4874ff92a6991/68622614596.pdfIn PDF document text
    • http://abnicum.com/files/file/53410826108.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c1273dbc3a84b75332ae5b9ec95cd349/didigap.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3209d1f9---reririboxalilajij.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0f622b700e502c5a27d2d29c273e41ac/75070541219.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6fce834d---kifeg.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/50700925883.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/dukoxasevim.pdfIn PDF document text
    • http://ipceurope.com/assets/file/3055291310.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/81647959485.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7f1d54513---5420056813.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b00114812---viwan.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jljjp0guth6mmd6r05oad3ti50/putopemozebez.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/tovezutujulivedozitenelo.pdfIn PDF document text
    • http://medica-brno.com/files/pitadixilunemotipexupuwa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/vawujuk.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10980 bytes
SHA-256: a353ffc81ce509b9862f5982326875f2c8d83ce7a04d3bca6253c9f724a55f69