Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7eafc7b9d1d09a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 01:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cec685f78970ecc7b5ad47fca6e16bb SHA-1: a8cd46a197baf55a179dc3cbc8c3e3927bae39ca SHA-256: 8a7eafc7b9d1d09a8e965711cbf0f0f16c28ae94a7595f0342758347597a668f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting. The URLs are designed to appear as download links for 'gta 5 multiplayer', indicating a phishing or social engineering lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload.

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.
  • 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 https://smidgel.ru/uplcv?utm_term=gta+5+multiplayer+download+pc
    • http://avandcie-energy.com/ckfinder/userfiles/files/33165523377.pdf
    • http://shesob.com/file/files/datikeguvozitusebe.pdf
    • http://sarljarry.fr/userfiles/file/57258729925.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/81192525168.pdf
    • http://langmoon.jp/js/upload/files/52794418209.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/zifogixunavu.pdf
    • http://gartenmessebau.de/uploads/files/ronokobub.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/xigegimi.pdf
    • http://mywayrtk.org/userfiles/file/nozadusewexuvalanoxiwige.pdf
    • https://eyetracking.pl/userfiles/file/zitofujazima.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4f65e68414213dc015b33d6741042ecc/99671036176.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381a454bde0---56358807268.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/vovafotomibozi.pdf
    • https://bursac.net/userfiles/file/51720821229.pdf
    • https://groupunsur3.com/contents/files/21694527503.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31597517731.pdf
    • http://meimagedance.tw/ufiles/files/sakumewu.pdf
    • http://dansensvenner.dk/imagesfile///90727161769.pdf
    • http://mlsconsulting.net/cms/files/File/30996043751.pdf
    • https://noventa.cz/media/files/file/46421622323.pdf
    • http://sungwoo-n.com/userfiles/file/65414858841.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/80g9hk189uq03vj7a19e6cr7s7/panijujuporinobekejogido.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fe201f8c830ef735868f3dabfe63c264/vamoxirobupunaropisof.pdf
    • http://windmill-bv.com/userfiles/files/51230816501.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9a06cd1ad---wuketamolowenazabezibuv.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_off0000dc0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16792 bytes
font_01_sfnt_off0000f421.bin
aa9998e93d59b0ba69f9956981a92a76b514bfb85373c82738d549f5510fbd55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 17864 bytes
font_02_sfnt_off000121b7.bin
37b7a1cf8c895079a2a93f0122b2411a6f44c083fdbf77a028a25d47bc148d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 10980 bytes