Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9e04307838107c…

MALICIOUS

PDF

94.2 KB Created: 2021-07-24 18:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d4d44362c2d44dfcb735e506e4cdbe8 SHA-1: 37cc5b5061a9619ebbc5e5a3ecfdacc47d3ae768 SHA-256: ca9e04307838107c148d42d046d04dd3d3d1ebf3fb81a2dbc8fa57154a52de3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, strongly indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://mdsalon.ru/img/lib/file/girum.pdf
    • http://skupka23.ru/upload/m/38245627350.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b2481e5889727b870265e90da717233e/91504166821.pdf
    • http://hourinkan.net/js/upload/files/57989094177.pdf
    • http://rund.cz/UserFiles/File/tuserelowuduzikajud.pdf
    • https://eyetracking.pl/userfiles/file/mazuxivaxu.pdf
    • https://easybuildapp.com/files/uploaded/files/dizefodobopefa.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d22a1e083127cfc20dcb51c283e92986/34254178203.pdf
    • http://francescofesta.it/userfiles/files/44805436967.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/13283410052.pdf
    • http://ubest.ru/images/file/7912821031.pdf
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/vunamogutomagidoxadiv.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/98083171ed7a2b23cdfdf916d016bfa8/nerudejesuwutevuvofu.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/19329197871.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3511cd61f5535ff05726251dd47c5d37/tutapelesize.pdf
    • https://planet-pvc.com/upload/files/94580205172.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/suxujirewimukoba.pdf
    • http://adance0112.com/upfile/editor/file/pipatadavaza.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f41ab58d2---jubedoje.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/66decvk7cetfldfot8ag37lj4h/97680924773.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce0a30c10---romonebezerosuvejivuva.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/28754c9d4acd5604371360cb0b2b1438/68471827956.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608648df91389---tetunutafivizelenibip.pdf
    • https://argumentua.com/i/file/vumawuluruwurakez.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/028177512cd050174c0ef6a534fc1df2/golozaxekogifutowizedaz.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a992e01d065---tujokuluxovapunit.pdf
    • http://teraval.cz/res/file/34954496570.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+measure+blood+pressure+using+apple+watch+series+5
    • 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_off000108e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16792 bytes
font_01_sfnt_off000120fd.bin
4fb2e02e419369634901c908cf0332f37c50ddc92339737d944491953524f9af
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 11412 bytes
font_02_sfnt_off00013b53.bin
fd51f979246f0a0b22b5b472e23e0b1f8249643218117f73aaa0932779ef5753
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 17552 bytes