Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc2969c5c31de6f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 20:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adbd1c7e015c37fbccb074d86bba4aba SHA-1: 53f771c5e600b00ba40c4b5afc00303db72132fa SHA-256: edc2969c5c31de6ff8697bad100bb217136fba13d97255421c2196c237cde36d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=sensi+booster+max+pro+ff PDF link annotation
    • http://musicandyouapp.com/webupload/editorimg/files/6199551007.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/vafonezopudulugudevu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/30474648722.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614032277eade---mokudo.pdfIn PDF document text
    • https://panama4d.com/contents/files/55612761861.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/xanuvekakekikov.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/kosakekajijemupul.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/laxomowiruf.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/biridixiravudebamer.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d336ee0ddd---55085714540.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/80054768778.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/puwatusepulajovalixu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032179a1bd---raxisadirososatefip.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/97397154599.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zepebenisima.pdfIn PDF document text
    • http://video-cycling.de/files/file/fugur.pdfIn PDF document text
    • https://spyboarcams.com/files/12066299488.pdfIn PDF document text
    • http://babamoleskine.com/files/file/45272090206.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/245b92e2c2e70f1633fdb6b241c113e5/xebigep.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/jeniludixakenujimewikomig.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc419b5894---gusamerukumodoluwiliku.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/voweritawelu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 10792 bytes
SHA-256: 77aac6b883f82b07c7ec811fdd10d5f1414ac1a4aec49306609e14b73996d3b9
font_01_sfnt_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 25292 bytes
SHA-256: 81505d6b8327e74d77bd31afba6ff3cfbef278771fd1204e0843074551e131b1
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 1760 bytes
SHA-256: 5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
font_03_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786
font_04_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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