Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3f7f18e4fccd9b…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 17:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06cb41bf4e25d9f2ded0d02ee019deae SHA-1: baa8f414174c516d01bb1b45fdc5f16067e42c51 SHA-256: dc3f7f18e4fccd9b28765ff9ce6d21b9eafdc6e62d6c1114fbc7de012ba7a35f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it could be used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55aa90f68---50998089823.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/wofabowunumuxiwe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdef2acc0---17609513580.pdf
    • https://ceccarbotosani.ro/userfiles/file/rusutiketolavapu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4023438f---66926533472.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb14e88a4f0---47497685061.pdf
    • http://gold-carsales.com/js/upload/files/45654230199.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9e576f99---93703037408.pdf
    • http://architettoangeli.it/userfiles/files/29374540404.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d7a507aa---59098683164.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/93da3344bc3350c9500e80dca6f6608d/suwojimowijogujadeboxi.pdf
    • https://aokman-drive.com/d/files/78555712031.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/869e96d4be52d0277d2be7345e976c15/73499237936.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/75490414328.pdf
    • https://masukpt2.com/contents//files/jawojajidowaxop.pdf
    • https://cmfnepal.org/userfiles/files/28986964351.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/85536290067.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7ff93ffe7c72e0707f4b93424ffc29a0/kobixakisirixuboguvelami.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984be9daa93---90183918875.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2c963c8b9b16da1fe532921b7239966b/ginezuwuzozujuvafa.pdf
    • http://hyundai-baoloc.com/luutru/files/25529449575.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6757a6e9---rasifafoxomum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=farewell+speech+for+my+classmates
    • 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_off0000f1d3.bin
ae1fe7d61563442029292d80a31e22ea6855c4940b6991efee4c6b1931ef4d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16256 bytes
font_01_sfnt_off00011bce.bin
16f06670c3c270180a11b9a5860af8d31ff67ac7823567da25c001291a32d558
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 10724 bytes
font_02_sfnt_off00013497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 16792 bytes