Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e01af25d842b637…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 04:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71e30dedfe77249fbba0fc93703167b7 SHA-1: ad2ecac10cad8fb792138012c883bbbde3bc2ccd SHA-256: 8e01af25d842b637d244a4b676ee6bad54742ed184c56fc7cf6a8f524b5c5ea6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a tactic of directing users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cablexconsulting.com/Upload/file/63388392939.pdf
    • http://123podkrovie.sk/editor_uploads/files/gumaxakipedurexonotofov.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774884f392b---rakogemilugoze.pdf
    • https://aksukartela.com/images_upload/files/lenafepigifijozuxojurof.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb337a64e51---81786858066.pdf
    • http://sl-light.ru/design/img/upload/file/wujetuvuwigopifimes.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47bc37c67---93729453782.pdf
    • https://advantagelic.com/singhania/downloads/file/78751326837.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/wamipolijexexifumutomex.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4d95c38c2b97a69143d5c996e7e4e32c/lupakebufabibekemopawov.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b40fdb67b---vakozaves.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/lojegetinivafivadi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098526387bcc---mepokepaxisufapavimuver.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9dcd82339c8d5472315746a4e449acc8/23112557759.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092537a13fc4---vamuj.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1232ca095b9fcf5d59632500cda54d32/fibexuwulutoseviju.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/uht8l0mrakjtd1epndp0uv1fqo/jozusalubadovafakeronoz.pdf
    • https://knurussian.kr/DATA/upload/files/202107010604053132.pdf
    • http://alexhofford.com/temp/files/file/vovorazip.pdf
    • http://dongshengcable.com/images/upload/File/selox.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c0812ddf273709e437da8c5b61aa89cb/fitesovokuzuramutu.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853f9a51ae---20430274332.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6ad16e6c06d64442455418a1eb05a26b/65747160447.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+become+visual+designer
    • http://s292376414.onlinehome.fr/datas/imgmail/file/48656306538.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_off0000f414.bin
4780149cfecc2730dbc4725f2c9f110079891aeb115e0e4b351bdcbb622785e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 17108 bytes
font_01_sfnt_off00011fce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 16792 bytes
font_02_sfnt_off000137e5.bin
b859ff691d36b130693a0b30e86a7bcd682d7c5eed0aff0ebb1ba910b9f85e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 11096 bytes