Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4807b51993a3d6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fc18e4baa13c9f7c34f132c0fc9866b3 SHA-1: 46c15f4362c4b5c3abdfb5b9db07587e6228b748 SHA-256: 3f4807b51993a3d664523b24ad9ff582e7729fa49875feb8462fa6341bc93689
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://newshieldinsurance.com/demo/gsa/final/images/file/lozigaboxasox.pdf In PDF document text
    • https://maxflowfans.com/userfiles/file/mikopep.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613761e39179d---45478920594.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee215fd69---47938759597.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911080313.pdfIn PDF document text
    • https://coevent.ru/upload/files/biwubokulig.pdfIn PDF document text
    • http://njchemland.com/upload/files/jasinawoxavulapipusa.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/77140084208.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/72043059919.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/tuxajipuxam.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/zoxesapavukagopeniwune.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/jubiravot.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vuzibisaxanuwusaxod.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/baweke.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/nefowivonakotijovezo.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rabobe.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/99167399936.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/newik.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1a4eee75---nepimofajumuxobujesuro.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/87972820818.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/98781547733.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/vajisisunazowarux.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/21282340773.pdfIn PDF document text
    • http://www.moyekolodin.com/files/3859758442.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/27071918876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+robux+real+no+verificationPDF 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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10544 bytes
SHA-256: ed8d266dc70adb339dffdb799aa6e38078054f4c6b3ac08a875e4cd4eb65af75
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 18896 bytes
SHA-256: 2545f196cb18ab0209b388013b5ac166c2e642ed3eb86af4598beb1b71a0bf28

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