Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aeeab748016c90…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f10d5e3db12ed20af2cdd697ae7a46f5 SHA-1: df3674e8b04d39dafeaddc3267068bd92904e366 SHA-256: a6aeeab748016c90638177346169649ab0f388890c046525484ce878efcc7a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://energyexcess.com/userfiles/file/93389198164.pdf In PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/jowoguromegaditoz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/g0dokbsforp4gmbrgd8l5tpfr7/9562660089.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/4692993646.pdfIn PDF document text
    • https://angkalaris.com/contents//files/wekekewuvutuboxiwujuk.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/rugoj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5aa08fb91---23611156240.pdfIn PDF document text
    • https://cooperspick.com/files/45690368776.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/85118166756.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/50655244628.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/36629978924.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a0b049787---lamapebamukujepukisijisuj.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/dubapugekiwiwebaxebizog.pdfIn PDF document text
    • https://penal-garazh.ru/files/xiramedekosazorat.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/nidexabifaretubi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/99dme3ouuroinm2brqof7otbpg/81733785555.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e44ito65omrgs6ol7fltpm6d04/fuzobimubaxoda.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/mejulopamusunu.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/16267142711.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/34772777702.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/de347142a90a0d6bedf2f88ba61700ff/deroduwisisepanoge.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zexawurezajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iti+workshop+calculation+and+science+question+paper+pdf+2018PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 19176 bytes
SHA-256: 14fdcdf21d8d5ea322a2415dddf29cc54af27678cf20db11e170cca8da5e17a9
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 11592 bytes
SHA-256: f96846de2fefca5d666d494ec5fb3c07a3eae74a992ee1c44d3ddf517c274877
font_04_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 1732 bytes
SHA-256: cc9aa9d10d6f336345dda96c648cf1cebe6fdaa1cf59576acfec5bb48f04b3bd

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