Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f50a762f41d35b…

MALICIOUS

PDF

98.1 KB Created: 2021-06-26 11:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4a50ce9673441a6fd3ba5c936e253f SHA-1: de58b5a077b8e05b5bbbb49e7caa8d43995bc01d SHA-256: c7f50a762f41d35b39348d00dc3673bfdfd295f024ba7520ddc25d2ce5456943
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to numerous compromised WordPress sites suggests an attempt to distribute malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb464b76d2---12288092021.pdf
    • http://www.aluvascientific.com/UserFiles/file/toxuwamamarefara.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210501145705826293cjgl17.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4c81efc8---31758142410.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dd41e2406f622e3b2792cce0f8a4745/nizelenovufor.pdf
    • http://www.darvidproperty.com/news/file/63182143681.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/wugimamoguzatuzavinuxine.pdf
    • http://villa-carlshorst.de/sites/default/files/file/18681393128.pdf
    • http://ankaser.com/userfiles/file/kunefusoguzunotid.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f22b6f110---ginet.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8740b5a5f8---bisudosedatanixodeso.pdf
    • http://amuseonline.com/absite/userfiles/file/xodefiragox.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2985472d1a0ed54e9eccacdd83818104/kerufosabaserogiba.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaf9164529---39006226575.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d3d36e79---jabitoxodavelaxe.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/15640082304.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uqo70cugkr030qml8u3irf6vsc/98379510435.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vc7hthnnra2msp1otjrgmvr437/41533382610.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a4f83c65c93c285eb13d4a78d1e582cb/49286355244.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f6649c1f0abf086597d690a324f11fe2/59531010089.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/63379496748.pdf
    • http://uptownchantilly.com/uploads/files/fasakipatiduv.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1b0bbc4e67c5115ab483529b0249613e/fexagebufapovugexeb.pdf
    • http://sewakendragroup.com/userfiles/file/vidowero.pdf
    • http://progfin.pl/userfiles/file/70908325352.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfb7a04dc---41652795665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+have+a+reputation+to+uphold
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010697.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
font_01_sfnt_off00011ea9.bin
3a9828ec0257c2c4ae88394510c97c16cb8b0f2b645251c7ae7140086a33223c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 18664 bytes
font_02_sfnt_off00014d99.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 16068 bytes
font_03_sfnt_off000162ba.bin
4f794f9c9440a9735ec233d96d9b54d3b77c168a74f92f7b68c2d8c9cbbaff80
pdf-font-stream PDF embedded font (sfnt) at offset 0x162BA 10440 bytes