Malicious PDF — malware analysis report

Static analysis result for SHA-256 fece25ab166a7f2f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 06:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b25cf1fa3238cc4235871a51530704f SHA-1: 66b0ee5e73c6673e01ef499e3890f237d8b5e241 SHA-256: fece25ab166a7f2fded98992cbc5c52e5119c6c5961f45817a8e0c2fc418c120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest a lure to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=how+to+unlock+phone+with+black+screen PDF link annotation
    • https://abctranslink.com/ckfinder/userfiles/files/lonowovuwumiraxutusu.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/durabusexipibomumekabisev.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/lugifuse.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3faeadfad---bapipeni.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/78572792979.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137665fb3cfa---73701044826.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/39466657905.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xigigizewagaritipibonuxij.pdfIn PDF document text
    • https://festacontinua.it/public/file/47363313781.pdfIn PDF document text
    • http://thevalleytrader.com/files/dazozukutojufapapaf.pdfIn PDF document text
    • http://www.ezmoving.com/file/buzoripuwi.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/40711546584.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/jakutikazazatagazemog.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pefak.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/43404105368.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/memomatebabijanunetilitol.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dezejug.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9f78b639e2b9306fea1148e370d1dd79/83206264926.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/zumewitofajakurarolid.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a8455c3d---57465762181.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/71438032311.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/57717224132.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135435875c76---38007123870.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bgmvnkj2trcr34vidkgesc3b76/sobepimexepomivavaza.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/66158292671.pdfIn PDF document text
    • 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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10880 bytes
SHA-256: 98945d336299828cce9b615aaba190ada0ca3dfd0e74d016a47ead8fdeb72a34
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 18460 bytes
SHA-256: 43aefe6fc41e19d9dcac5078921856fea9f88973313b6400f38621b793b0d610

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