Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e56280d6ff21ff…

MALICIOUS

PDF

80.0 KB Created: 2021-08-12 19:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0935066f891a472c94e41d42d1934e3d SHA-1: 15f0d548e316b6e3a1bc62cec57a624e99cabf08 SHA-256: 31e56280d6ff21ffac483774b14558bf5be9059fc74f19ee6b0b130736517bcf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV, indicating it's designed to exploit PDF vulnerabilities or deliver malicious content. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on disposable domains or compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

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://jobtiara.com/files/files/repeguzirinikemuvaf.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6afu9h8lcbhbmujq13l3m57or7/safavotadipe.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/mafiro.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d856b71b4---2148469949.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/1546618147.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe57b56c51d---puvanizoxazugebozulogig.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/suziropibitarebasibumobi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084855d430bf---48823545979.pdfIn PDF document text
    • http://df-2.de/images/daten/file/70469510306.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kubax.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/40803229417.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/54229399137.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/sonexajekimomemefunuxuda.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3331288b2e89c34a444a9d53a5b6feba/selefodukaxeselim.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/26850415515.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d4a0093f2c0615489f1cd11f90baac13/13895629005.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09aee17dbce856c008847417af838d82/93753350140.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790272368a6---81833207239.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/rutokeligulitegoxeroxidet.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wurakazibekugozudebo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43a57b5e0---kagewipuwebiligiwoduwogi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30669964768.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/72198493937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+ley+de+los+signos+multiplicaci%C3%B3n+y+divisi%C3%B3nPDF link annotation
    • 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 11388 bytes
SHA-256: 19605fd7cb58a0fa8f530ab9a6def80da022cbc41b1dce4e41d86a89ebc7b02f
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1