Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b36f6e13a1d765c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 17:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3132d12d431f4ed8c4b023f33b01935 SHA-1: 092b8fa4073a707539ddbcddc1c712dfab6d1d93 SHA-256: 8b36f6e13a1d765c2927f47652811c4962ede89658910e2c093fd1fe9f677681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=aplikasi+autotext+android
    • https://vibingvibes.com/userfiles/files/90738946317.pdf
    • http://zeroseistudio.eu/userfiles/files/32541056756.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5590dce---vixusukekakadalugoki.pdf
    • http://gfb.it/upload/fck/file/79527331302.pdf
    • http://tnhmc.com/userfiles/file/6303266369.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c22255061---patogobifuk.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/16170969043.pdf
    • http://sahrugs.com/userfiles/file/xojizitezurozokigivegoro.pdf
    • http://lynhuagiasi.com/Images_upload/files/18540758053.pdf
    • https://shiksha24.com/userfiles/files/ruwunuvuf.pdf
    • https://grup-rul.ro/printuri-fi/files/10253109378.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613503fc7e5e1---95310107547.pdf
    • http://ccsl.asia/files/661370129.pdf
    • https://123natura.com/stockages/files/43336795519.pdf
    • http://dominoliberec.eu/images/file/files/79715607380.pdf
    • http://qdjshg.com/files/file/lijujaxugufet.pdf
    • https://charming-dc.com/uploads/files/202109160618122363.pdf
    • http://www.petersonassoc.com/emailimages/file/soximonolaledumutiwo.pdf
    • http://skncn.com/u/files/rijopaxuk.pdf
    • http://membranekeyboard.pl/_data/file/40954235332.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/4757317037.pdf
    • http://peaceinsrilanka.lk/userfiles/file/39874003310.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e6a1c10cf509ae8442b921aa13aaee14/44948241674.pdf
    • https://tele-video.ru/upload/files/58216110539.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 16792 bytes
font_01_sfnt_off0000d9fd.bin
32d81144f855fd8a4050edb77fc0f57776106aa5786737617dc765c7744e6382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 15916 bytes
font_02_sfnt_off00010317.bin
c8c92c0f88447422d1ea9985d288ca0a51c510f6903a0fcf589ec416c09543e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10660 bytes

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