Malicious PDF — malware analysis report

Static analysis result for SHA-256 4239767084f74ea4…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 19:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: debf684870be33b383878fd0aa0b1649 SHA-1: 033027e7311824e5277d97017603f0e000fdfbef SHA-256: 4239767084f74ea4f5b73576edcce23f42f7ff9a35b13e6344f06b58f1d6723a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/58f9ff4a4bb688655520e49d9d17ec02/68942033506.pdf
    • http://sanders-scottfamily.com/clients/26926/File/7440453508.pdf
    • http://dd-eng.com/files/files/24334651205.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ec0e345---13016530816.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/sozekowilimebajubefeba.pdf
    • https://ytdrive.com/CKEdit/upload/files/24498732281.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec78978486---kabonafega.pdf
    • http://younewstoday.com/task/userimages/file/86453522869.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208599684049.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/e9lsbvg7aiie1pdrd3k4oq1o05/zobesubumigifagatozi.pdf
    • https://energooptima.hu/upload/File/84657607541.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0d860b33---82061660855.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/57c1468288a744b2886de9e49c7d0689/nebaten.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/34783846448.pdf
    • https://clickkedai.com/userfiles/file/molima.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b1b4add17---25030347012.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7bf3e0f3---nirejojiwulebaxuso.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8a35686560385a07072cb57ee166f44a/joxexasase.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba934c389e1d356363357f5f40b1a168/nuxuzasokab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+pentagon+in+circle
    • 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_off0000e318.bin
db2013f873b4954f8b625e0564c4068540fcb881960035d8b3e326e0fa5bae54
pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 10600 bytes
font_01_sfnt_off0000fb2c.bin
6c2bc997a866965fc28b3f2983ab99234ecfd8bf63c3bdfc66671189028b9761
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 17428 bytes
font_02_sfnt_off000128ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 16792 bytes