Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ecc77a0a8d3ef5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd0e0538d068f22b082c7fde6aa09999 SHA-1: 16d672956bc5a448af10db4de51b31a01dbc6abf SHA-256: 52ecc77a0a8d3ef5d779001fe48337485754cc94607625ffd4a1d3d922315040
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and heuristics indicate it's an image-based lure. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The primary function appears to be redirecting users to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=once+upon+a+deadpool+free+online
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613194ebdbda6---jipogigawamebidel.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihvr038hj8q9gu03et9m85vt57/21157439547.pdf
    • https://swaarm.de/app/webroot/upload/files/29707731585.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852e2e6271---zutatumute.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/35056120869.pdf
    • https://vnjhanoi.com/upload/files/707244644.pdf
    • http://ptk-tent.ru/userfiles/file/55426898230.pdf
    • https://creteservices.com/FCKeditor/userimages/file/40603096221.pdf
    • http://zhizhencn.com/filespath/files/20210901184417.pdf
    • http://dj-maily.com/uploads/pages/files/numototigafa.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3l8hscgda7ikh6l9e4erpqu7s4/52578879903.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/dipevuparusufi.pdf
    • http://lpxs168.com/filespath/files/20210919083845.pdf
    • https://grupo-kayros.com/userfiles/file/jodimudupusirodaviwubul.pdf
    • https://mimzyonline.com/userfiles/file/tulitonotefib.pdf
    • http://sostrevalli.it/userfiles/files/buritexotenez.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/53165422160.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/40424622494.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460a52d3887---3829612842.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351666e5cc2---16817559570.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d57e4fcd7bc6ee6df319635fc402b0b6/govunaruzaluvufito.pdf
    • http://vinaktv.com/storage/ckfinder/files/lejexotol.pdf
    • http://videocycling.info/files/file/41062692726.pdf
    • http://weddingdove.tw/uploads/files/202109192114118787.pdf
    • 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_off0000b2a7.bin
ae457e18b4027083ae26665a5f5619938b026857eb6f34f82bda0e7a9854415c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A7 14156 bytes
font_01_sfnt_off0000d59f.bin
d7fe3cc972510a0a97fe0b1bee67f4e9d12d4e49977bf7b0b8cbc4c1fdb97d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 10472 bytes
font_02_sfnt_off0000ed7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16792 bytes