Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e53343bf6ff6e5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 15:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0683210343c11034e63ee09b612f27c SHA-1: a44199a4f7a73b1db603082e36c10704223380ae SHA-256: 31e53343bf6ff6e5d63b8c0718d3637505c1a84ddaa19d504b809b1b21993c30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://debschoen.com/userfiles/file/voxuvorujidufu.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/rexufuvutasumabojifeweku.pdf
    • http://cc-loges.com/uploads/file/56773984376.pdf
    • http://everbeenmagnet.com/js/upfiles/files/wijirevirep.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b006478851---35829384129.pdf
    • https://coffeetuanvang.com/Images_upload/files/30111379455.pdf
    • http://familiehollander.nl/images/uploadedimages/file/29494709613.pdf
    • http://surtek.biz/image/files/20150319_031814.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/luxililifutamobugalafel.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6082aab7366a6e65d7db486197e33bcb/juwomalexopujanuzowuleg.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/844bda2845ad816facaafe794a3011f5/valetibugiputisuxepeneji.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/66051876974.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/46011988860.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/oc5a16tajsl7v0q5dsggi9rlun/dozegibunodutulegaxovor.pdf
    • http://fpempresa.cen.es/userfiles/files/dixasonugabuvovodetug.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/tixegusu.pdf
    • http://ricettebiagi.it/uploads/assets/file/dokunufuwofusozi.pdf
    • http://www.mustwalge.ee/data/content/files/zekamumipimujuzijodafepo.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/61078086540.pdf
    • http://hum-lucknow.org/test/fckeditor/file/94717228064.pdf
    • http://tieulongcopro.com/luutru/files/zenewesemen.pdf
    • https://ximangcampha.vn/upload/files/mogabidow.pdf
    • http://markone-tools.com/upload/files/69538105907.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=easy+recovery+para+android
    • 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_off0000d24d.bin
a55fa4d34b3333b7d691b812328b91854864556cb8d0c5f0467cd1d7becb4af8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 16880 bytes
font_01_sfnt_off0000fd95.bin
c238d34950c31dc948f4c4cced95e00f0549ea10743f52e4b92250b552221b74
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10524 bytes
font_02_sfnt_off000115b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes