Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b487b76feb0e974…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 22:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dc12e3bedb02950a578a9485b69a033 SHA-1: 4a55bcd272253b0b3fba1da4eacc9d7cce90d316 SHA-256: 0b487b76feb0e974b70695f9b9f136a92e63a009a42ad6472fea4306f9828410
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external URIs, some pointing to compromised CMS uploads. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect with remote support software, a common tactic for gaining system access. The embedded JavaScript is likely used to facilitate this or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://crewmak.ru/uplcv?utm_term=ro+online+android PDF link annotation
    • https://alnahamgroup.com/userfiles/file/36556068801.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/forerobiwesiwixojosudine.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/timutisiv.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/24882872294.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vosavoxanukanabefap.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/webuwozej.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gumetowiwadozibuguwiga.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61b4deda7049ff7955f463bd34d0a63b/dusiwimakusasirig.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/28796727482.pdfIn PDF document text
    • http://stisk.com/file/6237512223.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/95276021225.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mepeponoro.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/bilowulefupotogo.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xizowuraful.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/bojawuzogitogu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/zabidarogaxelif.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vosor.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/zodurenizeguxo.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/4006487309.pdfIn PDF document text
    • http://rhondachem.com/d/files/69354127937.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/27972227748.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rguin6jdof797pkvibfrcjqnem/68629705753.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b1c1fc9cbc454c807edd220307f4f67b/70994048812.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/61581356445.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 16468 bytes
SHA-256: 273641bdd47ffbaba25e6dd177f254a667ce3ca65c45fc40496043bc0b2b9e4f
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 10020 bytes
SHA-256: 748b1169678cf33d670c3e3649992300a67b9df63f06822a08d818f2d98bdc68

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