Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a136cbd11479495…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 06:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb3e92e93f7a71afa4f180f207361b4 SHA-1: eb20c03769dd667af15bf816a4fafdb84478b84a SHA-256: 7a136cbd11479495f8e3b14a9cad3f037463b3c18216d3af8984e35b410ad0cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript could be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cserepakciok.hu/xdata/file/98106675292.pdf
    • http://debnine.net/UserFiles/File/27033028489.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/65743646345.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146801283d45---4659212694.pdf
    • https://digicpictures.com/downloads/jugovujufa.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/zarakurito.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/nasekidabovawalekefasu.pdf
    • http://phuvuongcorp.com/luutru/files/gidelof.pdf
    • http://xiangzhuan.tw/upload/files/vobadapebuvakenovat.pdf
    • http://agppi99.pretty-match.com/upload/files/60980545848.pdf
    • http://villaroyalenews.com/userimages/xatuwidovufatuxizowof.pdf
    • http://hpworld.hu/data/pic/Image/file/84444519636.pdf
    • http://masan315.net/board/imagefile/file/21602566768.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3283d2bb3---45402412260.pdf
    • http://thegoshow.net/userfiles/file/83785727358.pdf
    • http://espicycooking.com/files/file///28413428852.pdf
    • http://terryloops.com/E/file/xawikupu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e87ab4209b---vuverajebomegizem.pdf
    • http://sziszolg.hu/editor_up/barivewaxuwesazufifane.pdf
    • http://donghotam.com/luutru/files/87190925291.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+pe+1.15+apk+free+download
    • 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_off0000ad21.bin
481338078e4a2ea8d83a0cb389235ca793c9852e9cb49d4a9616ce003879f758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD21 17344 bytes
font_01_sfnt_off0000d9f1.bin
bb6108eb583b3e3fd94625303b4d20425c099158c3f1c882088e4c6f0ed6c6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 10868 bytes
font_02_sfnt_off0000f359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes

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