Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2b92afc81e7f09…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 23:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ed1bac3fbf6d25e004f8dec0e418e48 SHA-1: ee9d77f86d04b7038bcef934cbef1365a907d3fe SHA-256: db2b92afc81e7f09930afd842ffc492a1bb1511a730fb55069ce35614fb2abc0
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=new+ringtones+for+android PDF link annotation
    • http://dongtienlamnghiep.com/upload/file/regalam.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/ladolij.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bobitem.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/jisasumewojide.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6be3891813b52b181f4ebac70c5774f2/dakapaxigewokutotosuvaf.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/janubexemaxugufebef.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/gujidavitesorokewof.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/97127975055.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/18540784368.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/jegetilovag.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613cedcbede79---xamosudujedeberipeloz.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/viwamob.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/94761190602.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/dufuzelazosegezebep.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bitepomedawigefupalinokux.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/goxowijoduvu.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/2076253661.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/14390889851.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9gjpr488q47seog7u8j9kcr462/11805454487.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908021950.pdfIn PDF document text
    • http://skia22.ru/pic/file/xopinawomipamojefokovono.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/bezunavederonibabawegikop.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/49549791471.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/61100251026.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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 16836 bytes
SHA-256: f7fa33e2156e9b251de654a1ce76ffc7b7c33b11fb04f582a1cc613af20f8eea
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10544 bytes
SHA-256: fc4b105ca2ca5f73d8a8558e1b631910c5a26290230492cf3f57041b7fedbb2f
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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