Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8528c3bac1aafb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 10:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ca962bf2a5300d6be8d29102398dc34 SHA-1: d3c6981d1f4ea776a736aa3d1d97626476961384 SHA-256: be8528c3bac1aafba86353b82b62e2dd3707651f6af90e443178fe34f5ca6c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, redirecting to various domains, one of which is a compromised WordPress upload. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=55+inch+led+price+in+pakistan PDF link annotation
    • http://gurolmumcu.com/userfiles/file/98377527131.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/putizomapabekeji.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/58q60suhseg5cc1du3d0197k1g/35026316625.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/vigosexanejiwexisutudom.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/pekokiziwofugat.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/81886381650.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://njchemland.com/upload/files/74199728301.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/80978207201.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nujovabafefejitagot.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/53839490787.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/mozezavapa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899c3b2a6---tupitun.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f97tf5pvqbsa2tmcmcb8gv5626/83899714533.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dejobaboxuzeseki.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/nikinis.pdfIn PDF document text
    • https://arerp.kr/data/file///15280175758.pdfIn PDF document text
    • http://minhanh.com/files/28915924832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136929e3680f---gemupakamaravavazopagib.pdfIn PDF document text
    • http://voijin.com/userfiles/files/18654656565.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/suvoresepiravaragasuga.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/41365515750.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9d119b0d---17786500267.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/88940067786.pdfIn PDF document text
    • 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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10620 bytes
SHA-256: cc8f0cec8fbeb980e7b8e8e40a3ba9e7d118ad555379cd161515f2db0e45c737
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18036 bytes
SHA-256: 76fbd120c2509729afc8b2bacfb262c4b0ac58f13845dff1a4036b009e68ffd5

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