Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7f1eab02f98588…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 11:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95e9d45ebaf9680214f14addce59e054 SHA-1: 4e9167c96b529fc9f6b4d7aa916e66c04c96e24e SHA-256: 3f7f1eab02f985883590642679f4d7d77a17f2421de35c5182df09266d451312
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. Although no executable scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack, likely a spearphishing attachment, designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ho776ojdonq00l6aarpnju4f53/gurefonusudowo.pdf
    • https://palcev.ru/userfiles/file/36997284346.pdf
    • http://charivne.info/images/file/33493031928.pdf
    • https://jin-ji.com/upload/files/74042882306.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b4af3fc6---2785341129.pdf
    • https://by-express.com/upfiles/editor/files/wadotefulunaf.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210904_2E8B3E5CC27DADC4.pdf
    • http://smartpaintingplus.com/userfiles/files/90402399186.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/batupa.pdf
    • http://yasairamenbar.com/uploads/files/garawixiwulo.pdf
    • http://eichler-kammerer.de/kewifizuz.pdf
    • http://werkkledingverkoop.nl/images/docman/files/57922697084.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03c9de92---21810158106.pdf
    • http://vigova.com/Images_upload/files/jajuzebasunizotosut.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/2672295252.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/lawulumibakunexarag.pdf
    • http://antitumor.org/filespath/files/20210912024834.pdf
    • http://acecaalcoy.com/userfiles/file/lufugamami.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/neden.pdf
    • https://mokhalasati.com/userfiles/files/24509251825.pdf
    • http://tech-in.info/bramy/userfiles/file/27957592138.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/gusebede.pdf
    • http://bsbcarpet.com/userfiles/file/99197156110.pdf
    • http://netmode.net/app/webroot/uploads/files/39917834737.pdf
    • http://yuqiaohome.com/uploads/files/202109021201327514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+mobile+recovery+software+free+download
    • 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_off0000c22f.bin
8cfb6bc9205979bd2caf16f5fb8c7494eae6de2f03fe635fb0475ecfce3ab8ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 16840 bytes
font_01_sfnt_off0000ed07.bin
9c1b193c280edb1d569d65b27fdf837dc1ad99c42387565803d85dae3266b3db
pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 11024 bytes
font_02_sfnt_off000106ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes