Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8e12c6fe034630…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 09:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e1cdec881b23fe94c2fb2cc9eea6a37 SHA-1: d9316ca129009cab6c9aecd31b5c9b30c0d6ecca SHA-256: 0c8e12c6fe034630982d8af05967bc02c7be1dc75e17bd7b8f43585769841c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no scripts were directly extracted, the nature of the links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/36lem0rsf94pjvq1s4rltrs7g0/pebipolavopifapototipo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e605bdbd---tavevepotopoxevidefutijo.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/70542106762.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/oit57itvfeqkf5sgrol7tfl65tag0sr9/pobazopujagip.pdf
    • http://superfishinglewood.com/uploads/files/13901729959.pdf
    • http://longchimvac.net/app/webroot/uploads/files/jajazavataxop.pdf
    • https://lawrenceyezersky.com/userfiles/file/30223518182.pdf
    • http://struttur-arch.it/userfiles/files/nolosepebuvaxixakebowix.pdf
    • http://davidhammerstein.org/userfiles/file/79887858538.pdf
    • https://lesura.net/userfiles/file/paginedilaxamorudul.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3221e6e1---80770730955.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38998f7d---xotonetunidajaferaxov.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8843427f4c---gizapawixofa.pdf
    • http://cdwy028.com/uploadfile/file/20210615154550.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9808ded5---39460870467.pdf
    • http://vom-ragnaroek.de/uploads/file/66877713121.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16110421aca84e---91259966189.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e91d5467f---86122314292.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8a35a465---13690078602.pdf
    • http://www.tobywells.org/media/fckdir/file/40111218493.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85d629de4---xexikubugipup.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ed00f5023695b13fb31bff5306d2d048/rifogigamijafebotidi.pdf
    • https://istanajp2.com/contents/files/72043652767.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=effectiveness+of+school+rules+and+regulations+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_off0000e982.bin
27fee5ae7ce32b009d4078e37ea8fb927ffcfbe78a44387e45190e19dceec612
pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 17032 bytes
font_01_sfnt_off000114c0.bin
323affd2cc596961f46d749de107dfaa9a37f98b18fd671c628c91dee918373e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 11048 bytes
font_02_sfnt_off00012e33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes