Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51c9eeb3c8475be…

MALICIOUS

PDF

66.9 KB Created: 2021-09-17 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77ccc900a906ecd89fe9e60dedf6d593 SHA-1: a5353fc08672adc3b230de5ab8ea3d5415eed7d4 SHA-256: f51c9eeb3c8475be6cddd17d9b82ee8c173c5dbee4dd93bb86eefe78e65cb8c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links lead to malicious content hosted on compromised sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1638

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://laborke.ru/uplcv?utm_term=gta+apk+vision PDF link annotation
    • https://www.hippocratio.gr/ckfinder/userfiles/files/61915616305.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091517382773499.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17d8897af42dca53ce9e08426e2fbbe/73007047831.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/65053014454.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/siwadak.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/85667079962.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85194342591.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vosesemolevukanonogule.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/jarewelirufaduju.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/23621970858.pdfIn PDF document text
    • http://sswjeans.com/files/56235581316.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/seguruludi.pdfIn PDF document text
    • https://tckontrola.hr/files/pifosunaxajusibanodo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68a8a4473ef799e298d2327911413b88/98310495717.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89882535240.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/23557140109.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/vuromobonakib.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67210604826.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a85cc4ce7d632ddfbdda48d4fd16b476/zumefum.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/5917993396.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/51799694246.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/geruwemomerolepijapi.pdfIn PDF document text
    • http://parentini.it/userfiles/files/lobujotulixulotarix.pdfIn PDF document text
    • http://saint-party.com/media/file/5813948451.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/veverixolelawumusepexumov.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nimotitebamijunosalu.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/torixofuverififoji.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/87538673395.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 10164 bytes
SHA-256: 5ea2c82d53935bbc133c6fd50c9453e920eaa319e6121ac5c2e40d0267966a15
font_01_sfnt_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 15572 bytes
SHA-256: 32177998bf1bcf37c0a219bcee3b19f15200c352faec1d3f4d9364dd3fd422f5
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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