Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0809f2960b7dfae…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 04:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 587bb299999f667153364daf1c29f47c SHA-1: d6bc159a35d9e4730a08d90cb9b3e9c8dd001243 SHA-256: b0809f2960b7dfaebcd382b15a4bc1a5e5dbcb6865320eb856523c96945c3f4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://extrastyle.ee/ckfinder/userfiles/files/87896508691.pdf In PDF document text
    • https://elperrocallejero.info/ckfinder/files/34842600855.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7638b1fa---rozikojetowufepo.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/42395941376.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/26251485702.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/7205193578.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ikno4fnhhsin323onb5bpdosvo/lalepajuzalewuxemezenuti.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/98269280630.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/96055379611.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/3773349152.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210905_116A2AC4075D5BE7.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/rejosukezi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/40504462014.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161421ca3b79c8---lexoxinaremazok.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/25781418973.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/59115021178.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdfIn PDF document text
    • http://mrybalko.ru/files/wozedowegoberil.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/10591449732.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/525f5b7829c198de25c5c6a89d89e525/40127773842.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/34684031308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+apk+download+modPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 10412 bytes
SHA-256: 143c8d3cf4582553298d4d01a544141d038ce59d080d6be28ac08b0ea2dbe303
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 18912 bytes
SHA-256: 52429eb46f0783701503583cd66e23a051ad018df479834c0acbec76ee876f93
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1