Malicious PDF — malware analysis report

Static analysis result for SHA-256 b684b565f7f14882…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 09:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c39de85553cf5a0237edc9ad38e56e7 SHA-1: b0d5d05f155feb4dec67c9612ce3eaaae17a6cda SHA-256: b684b565f7f148823627ac1bf1d1055579997cf70e91dc026f6badd2cb9fdd8a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to external resources. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://foxgraphics.paulsfashion.in/files/jomufimufezogesagafuredef.pdf
    • http://b40555.handyfriendship.com/upload/files/dexovakojizitovuwimuw.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lf3sdsbkr4bdahhoudnns3v0sc/84183507945.pdf
    • http://studiogalata.it/userfiles/files/jizaradolekosoj.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a67783991b23e3e55c36bf22dbcedf8d/kapetapepem.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/kajazifanek.pdf
    • http://basketaci.cz/UserFiles/File/solulojemopo.pdf
    • https://mps-india.com/userfiles/files/27067360985.pdf
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210902202620.pdf
    • https://villadelauca.com/userfiles/file/45105417619.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4395ce92---gavegudejupuxujonozok.pdf
    • https://bakwanudang.com/contents/files/vokepuluxudisil.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/lerovapinevasab.pdf
    • https://joinvita.com/neu/userfiles/file/65084542422.pdf
    • http://kamakuralosgatos.com/uploads/files/11174809387.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/48553076102.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/30782907255.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a7c7b2413f9309ef634a9d6f3af643b9/41307422084.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/48033145474.pdf
    • http://salon-urody-bellis.pl/images/file/kimegowixudizinosub.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a193a9921---99248721621.pdf
    • http://soles2walk.cz/data/file/zojijafebujafebazaliwe.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+get+free+v+box
    • 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_off0000d11e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 16792 bytes
font_01_sfnt_off0000e935.bin
126c163e5bb99b902b295e161f93cac5dfe7a1af140864534c9b8d2b715951ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10556 bytes
font_02_sfnt_off0001013e.bin
f1ad921c89439179e58dd11578047076f2c511324d1753f1ae5b68febdc5c938
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 17408 bytes