Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6bda17390c106e…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61c3e1b673634c8c6442d1e7612d2113 SHA-1: 3803225dfd5037352e4f2fcd70d16362e34a535b SHA-256: 8e6bda17390c106e8df9af991394cda29f0a671e9ed3a7fd5fccb96f707f4cfd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://equator-maritime.com/userfiles/file/66515631457.pdf In PDF document text
    • https://alsultantrading.ae/userfiles/files/tosamofozowupej.pdfIn PDF document text
    • https://tpk-m.ru/files/file/48888179013.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/tizoxupapisatonofup.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rorawa.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/sofivibudibikiloloxifefew.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614633d682244---32371390968.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54208632431.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b2d00145---69092708776.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31755056779.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/merex.pdfIn PDF document text
    • http://financesnadno.cz/upload/file/tovejitelena.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/70639444127.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f295af12---misorefusonujesuj.pdfIn PDF document text
    • http://riviera.az/userfiles/file/fadugire.pdfIn PDF document text
    • https://petek.biz/resimler/files/75474465220.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b965796835---viruziwuvaxamasowomuzuga.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/24188267201.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8b9700b3f2897a9a0a8fcba14d791c61/tidakikiwelosiserobu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219131525505217.pdfIn PDF document text
    • http://holzbau-napetschnig.at/94223943618.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d85014a617---rupedovotu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16151c64a86653---dajubirowebufibuxedavuw.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c3844c2fc---27428463730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vehicle+info+apkPDF link annotation
    • 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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 10272 bytes
SHA-256: 2743c83681b0607a205630d665c49aed7441f331ba9ce3f411020c9ba9772c0b
font_01_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 14612 bytes
SHA-256: 0756a818a7db80d35ac184c0f1c4a5b96dd096144035fe7f1b65c0f0f3e4ae7f

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