Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4225061c838024…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 06:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2b947e68c14a091a8fdde8e1aaed4ca SHA-1: 7b30366eedc8468911402fbcdc359edcf3996070 SHA-256: 5a4225061c838024e70aadf5874e6a860bdde75dc8db04043658d94568d6b922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself points towards a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dgjst.com/upfile/file/semepezilozukere.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5l45d982qgs1r57v1ekrsa6odr/wezokutugonizesuse.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wubakufazefunanemexenuf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841decb2fb5---28648403918.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jofukekojopunelireneg.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65500558544.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/64057076445.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/90050563945.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/fefipixopewafuw.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db34210f4---gokivizomekitufomomujogol.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a36c5359---xawalunebibej.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/lokagibugileg.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/259c3fbc17f1fbf5774190404cf7753d/vemigeninofudukewukuwa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dc773267c13---xuwamikofenazuzogufokaz.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/29855184712.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/rojodopurubenikapusawukaf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d226fbf3---gitixofur.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/10210223665.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/44322949019.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b264d49e2---14114488074.pdfIn PDF document text
    • https://langumeistras.lt/i/File/boredisululubufesemazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=medical+terminology+pdf+downloadPDF 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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10988 bytes
SHA-256: cfb1e5222d9378da888407b44080be73e989fa6895b9333ac76bb10b6b0e8079
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 17356 bytes
SHA-256: d2719fa34679b1cdd7637600c61cb0c2b5724b0f2f27e77af2a0c38ed562898c

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