Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd56746c5522b64…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 10:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a0bafd95ac9ce52071acb5ed8ce36a6 SHA-1: 216b0680cc61bb2eb59069d9798b4c1c9dc120bf SHA-256: acd56746c5522b64a071d736068b2185850535dfe76d1d083fad1e8841d22caa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=encyclopedia+of+chess+middlegames+pdf PDF link annotation
    • http://sukhonthip.com/file_media/file_image/file/gigivutikibovowiz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e56fdb2105---72560464605.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/vivaxoxoxu.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/54366676828.pdfIn PDF document text
    • http://potlista.com/file/files/kagesowofip.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/delotulaluganeb.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5f4bb7d7979855dc1dc5d0e835f82b87/67881856146.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/kulenanuzaronatiwef.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/64880302077.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/bunexipuputibuletixekuna.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/80086862946.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/deruxujur.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/37919213154.pdfIn PDF document text
    • http://kgmda.com/upload/files/29172464096.pdfIn PDF document text
    • http://herve-coiffure.ci/files/26629402997.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914102333.pdfIn PDF document text
    • http://moretonassets.net/userfiles/tisafoxabepedavukoju.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/30065838854.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/biwefajisazubulor.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101831377411.pdfIn PDF document text
    • https://value.ae/userfiles/file/gulejufeligex.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/serarodulebosizazamo.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/bojeza.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615618d0005a1---wuxonuxufulizut.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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 15008 bytes
SHA-256: 204c05813e7d61fd7152a8722eb347d5a1ab958ddb7fe679d9fcef28a5a1da11
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 10968 bytes
SHA-256: b32b78c234c2f19650f14bbac105a6502a333fd69d5acc9280aeb128700c9622
font_02_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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