Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f403ab1344e62e…

MALICIOUS

PDF

74.4 KB Created: 2021-06-29 02:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff2d0a14ca9496858b28ff68436e9304 SHA-1: 81852283c6ca1dce024f8e1aaefbcde4693787a4 SHA-256: 90f403ab1344e62e4b77ee3a350f2d6073191c154681d15207d0649ec12c68be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4d771ea7---borikoruwizajumef.pdf
    • https://havanic.com/cache/fck_files/file/gifitidixigazibewo.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/93897743918.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7cfb4198---bonemo.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/879c9b5e9bf2d675808cbdf10ac06711/41944646304.pdf
    • http://apexnepaltravel.com/userfiles/file/lokobaso.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ufetk5rkdb69rd82dsavovva7t/95001372232.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da765a88be---36774996617.pdf
    • http://guchenes.com/d/files/49862825376.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a40aed63---jadekolamoxetugisiki.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a65211bc---7557974336.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4137g7q9cenop6mpoottvp2lt2/kobugezenapikozagakepak.pdf
    • http://uniquecharacters.com/upload/files/padetelojaduxikem.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/nobowawifunigagug.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dbcdee59---voxevonubonosutiribexozo.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094b89f6312b---21673854632.pdf
    • http://imailbox.nl/images/uploadedimages/file/golagifodukigazur.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d95e9b31---54724216532.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7fbcb5242666e4e13c4368898af86054/xifefowopo.pdf
    • https://anmimar.com/royal/userfiles/file/19383233848.pdf
    • http://sportgalaktik.sk/userfiles/file/78936321035.pdf
    • http://vogiantinhmach.com/media/ftp/file/86094579360.pdf
    • https://www.tunnel.de/files/uploaded/file/vulujaraxokifapaged.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=frazer+brookes+i+double+dare+you
    • 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_off0000bfb9.bin
87105bb2851714ac0b779d6bb87709e025d9e5f9c1f2bb8d8f69df0eab96f97f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 10524 bytes
font_01_sfnt_off0000d7d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
font_02_sfnt_off0000efeb.bin
aa79f409951835074762a8b990ed5658bf8a6d53d5c0a6ba34fbc03b3123de50
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16932 bytes