Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5956532d2dbba9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 06:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d912847b8ad2553da3ad277ad08b582a SHA-1: 18fc2f56a9585f30a2c9ecc7e0a8c96fd1077d0e SHA-256: da5956532d2dbba9a57b5c1d76a5c6fddeb58fb06e4ac4cf489ce976938904ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. Embedded JavaScript was also detected, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=android+11+schedule PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e526c543---bafuxuxefidatalad.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/42289734744.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/jumitoroj.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/joxisaxikakevaf.pdfIn PDF document text
    • https://asiapharma.la/files/files/teragimixoru.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/88886908089.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/68401346435.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/12085387004.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/72886987100.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/tifare.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/xinojenelazosejekerizijuw.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/70404864590.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/pozasixilugaririk.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/24725767415.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jebelir.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wonozazojibol.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/guvupozudimupodavi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6ba171815ca3950745428ad3cb427a54/raxiwurelitoxolizagazu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/18335126894.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132254293073---sokemimit.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/59761488600.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/werax.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/javurumaxe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140794b73d0a---30618732878.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tofexow.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 17476 bytes
SHA-256: 3267e96d98d23254281faee3c67a12d2a020c8ef085478d91a065ac267450d9e
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10340 bytes
SHA-256: ac08a372afabbbcf6e4170a94e69d4d179a1969842bd48fece5366cb5e5092d4

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