Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed7fdd2f0a6a071…

MALICIOUS

PDF

70.8 KB Created: 2021-05-17 21:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9cff637eeb0b9ebe5c4be29e0b8306f SHA-1: b5534995aefa6e0cb68dae268b61805d1106593e SHA-256: bed7fdd2f0a6a0719e69a6c3b842fff6355ebbdc08fb59f79b7fa58ef148496a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection for malicious purposes. ClamAV and ML classifiers also flagged this PDF as malicious, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9674

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 https://coretry.ru/uplcv?utm_term=automatic+call+recorder+pro+5.+57+apk
    • https://alakharia.com/public_html/userfiles/file/rijexonidel.pdf
    • http://angelescare.com/userfiles/file/nefop.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa77d4cd8b---83985105435.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mq7ptnvmk31u5frgokn4hjq8v7/30655136111.pdf
    • http://akinmedikal.com/uploads/file/rajafibipuv.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5k7utkg0d5tgeqcr0vekjn61r3/dakefugeravojumakuz.pdf
    • http://aftckwt.com/uploads/file/4335976190.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609673b839de5---salomuzejeziwo.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a46eb83e---74976519436.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4900f5195733f672e9bff81082495844/6625463522.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793ed197a86---49787826049.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/51513d847c1d5a5b29aa9edec7dd815d/3119000181.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160817a94b82fa---59699750586.pdf
    • http://skogsformedling.se/bilder_umeny/File/tidixegogeboka.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/14f8a625810951b8bbacefa63bd8ab10/witenezifukiwokikesogato.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2c4b7f22---99290585266.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084115d18831---6284185872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d61e.bin
824f2cbb5f4d8deb0dc08977d226f3b67406e2ea3e962a93f19915e5c4b6cb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 5104 bytes
font_01_sfnt_off0000e789.bin
950a0706eb0a5e2fa4f214d01fe1a8eb8de2106a2202e2d898efca7efe96c7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 10004 bytes
font_02_sfnt_off000109ee.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 4324 bytes

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