Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb80b7b4837aafc…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 07:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60787b071b8ad7e7744a19830809d220 SHA-1: bf0d1326ebb67fffa21015970db5d61b2b61a178 SHA-256: 4bb80b7b4837aafcf50020c61b5905681f23157292655e212e723d3bcf541949
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it 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 are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://4reality.cz/userfiles/files/23452644308.pdf In PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xefebemare.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/700406881.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/23267293339.pdfIn PDF document text
    • http://synfarm.com/upload/files/beboku.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gnk3snkk64l8om953br8nebgus/punoj.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2fb563e368a491427611c4d4288a70d0/65758817273.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hc97ehvbneogvmcek7797iqgm2/bapewusid.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vikubopixebevutefid.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7413b59f0e34c1857e3736a3ee400113/letezip.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c60ab483deb34ad31d05f81d416d1f5e/23170823677.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077c206dd9c3---33124508302.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/sumegu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb9165801---77164964530.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/majazotedasew.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/02f75aec1d5cce1f8a553330ab1447ca/jepomizirogaz.pdfIn PDF document text
    • https://patc.fr/imagesfile/lafusamoniruxuf.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21169082934.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/lapuw.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/cfqn83mq043imel26j9nstmiel/84404507035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=un+ejemplo+de+narrador+omnisciente+cortoPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/razebosi.pdfIn 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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 18540 bytes
SHA-256: 7670c4e589f565e5d9ac83765770238c829ad42227db971ed5b32aa6cf5817cd
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 10812 bytes
SHA-256: be23dd3b97070fefb306b65c3b6b8507dd076b7255b0e15fc0454e7cea5a1ef7