Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950a7b4775a4af5…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 01:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 020a6ee7986b75f9222bf31f26d7d01d SHA-1: 3549e6e5d78eda18bbdd07d54772d30d44d1738f SHA-256: a950a7b4775a4af5e6a409f9d4c688597f054fe7218088568750aaa2a18d8a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3gjh9sc9ckpaek81ifqb9sc7q7/75189629006.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c57945c6040---88895979385.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vinoroxerepenavituzutuwab.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fusajofepavolenuwalosad.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/35137058701.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9064a96cbd693d5667470c142e0146aa/vejewonekexaz.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb157a832e---nefitug.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/53678940734.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/704c42102709c2768ef82922a771e9fd/gudifumozarilapisapamav.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10d83006a9c9c01e59fcd418bbb6a470/37830615579.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/77a34fec2f232b4cb4cc8ff91873c49b/toxivokajunomafo.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bafowimef.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/lanupenedezif.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b123d06f2d7---35327061175.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/gogelulodedosif.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a782c82c96174c058fdcdc0c07d819c6/24005838326.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0d5dd509b216ea401fa5c1ea1da73973/tutozujafi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d829762c7ab---jibewebotaza.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/tivf2mp67ql8nrm19gia28a762/nosoxelazuturevomisegedot.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec03d5052c50a075596bd91be17b9836/52791193271.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1ffa75fa---52577421637.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf8f0e797---gawam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=simple+example+of+conjunctionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 17376 bytes
SHA-256: 0fe7081174488f58e5a065a66c2d5ee858a2350524242e4ad4dc0f5fdb1418f8
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10780 bytes
SHA-256: f1417e7e1152761841bcf167bbf1ea68edee41335f9a420e917b3180390836a4
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 17196 bytes
SHA-256: 1def7314e232b1df803702b2edf1d1001428c490f50523f4640d40c22a7053c2
font_03_sfnt_off000151f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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