Malicious PDF — malware analysis report

Static analysis result for SHA-256 f434547e2c7a4624…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f507e8f16306e1d0c9c8d5d64a171ed2 SHA-1: babdc2dd4bee9d03c0086ab077f38abe432ea9ff SHA-256: f434547e2c7a46249ca1797e1235f2f307848f48480221cb318e5abf886eadc9
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a remote-support tool lure, instructing the user to install or connect with such a tool. Multiple heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/3005t1hl3lu4t8ijad3inaq6m3/togabadugeti.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b70caaad---waxezidam.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zuwekeravavuxu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c524278d07402cfae7fffda36b6c3d26/77121188267.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/25194871087.pdfIn PDF document text
    • https://digireg.pl/upload/53365257624.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7439f65ee016f3c34f98be20de425284/wakogasukekokinimolasu.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/32154130578.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6df752484---ruwinegado.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/senaz.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/mivajelalano.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb38a0c68---82304017635.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0pkdc7qdc122pftc8un613nhvq/45466680060.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/nexinamalopamovagov.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/59091701033.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dddd37a25---wujatipimibixuworavura.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4908d4d5d---tezobadutonogipawe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dde446eaf---xemelave.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075647ddc750---mabire.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/30315116843.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6cb35jr9gvd2oav5hcbn9v75a4/zoluxozakekivo.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/pakorebo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985a94667df---19957332563.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/womidur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=snowy+pines+white+labsPDF 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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 18040 bytes
SHA-256: 2f2e5e274626bbb000fd4ea77a404c0f6e2549f568ff13f4b8aef10101eac1e4
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 10664 bytes
SHA-256: 9e9c4d19633f124e1c75f559a2d153f1d0880feb3efd5731b8627ce2d11964aa