Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfe584e33793686…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 06:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2acd70f1510768ff6f13cc92ede4cdb1 SHA-1: 23a517f6e151a7564aa60f2c240b5d7b5de32edf SHA-256: 4cfe584e33793686e0778d166d24c5f24a7a922ac0eae831503aadddea1c95a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/94321b38a15f0d4d7e119793b4ffe3fd/gorunijusibare.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a63c3c120f---88131043713.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a216608d---donozetogajux.pdf
    • http://colafranceschi.it/userfiles/files/39583416557.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/36222434827.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fac58c17cdeb60d3672563aa264a4e4/mivojufawuzomag.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/293b576c4350cdb543b5ddf05be6b3dd/21688021558.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dalobunisejibeparetejukos.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2270e6a177---22138331485.pdf
    • https://alexandrapanayotou.com/web/images/static/file/notelapatide.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nuhetcf5dcq5h10pt1975q09gs/tubem.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/033bba265b32fbf39e758b75cdb42dbd/noxotuvewopebevitanu.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6e35395a39096c9c0b47fdd5715e3be8/58538272808.pdf
    • https://aspaeng.com/files/image/files/31486140737.pdf
    • https://allcreaturesinc.com/files/files/dujomirajugerafil.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099153ee661a---18862343212.pdf
    • http://proxima-design.cz/files/file/80212001379.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/07j81mnpa284vlbonl5t47d38k/sazijiborin.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc73ecfe5---mozekezurenezonafomujife.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/zixifu.pdf
    • https://mytalk7.com/_UploadFile/Images/file/kisixixoxevikaridokefuka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=out+of+office+till
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dc.bin
007a86e16cce69a4101823f9202a342b2fbfc136d4ca8d05467d7cbc20534091
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 9920 bytes
font_01_sfnt_off000109e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 16792 bytes
font_02_sfnt_off000121f9.bin
56c2249bb103d4fb4dc2774f8665d0b1fda74fc228f19d175c236f383749470d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16828 bytes