Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e93c0af0b37340…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 15:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6bfe0c06d00ce15854b8f4c4d2ec90c SHA-1: 849593f23c93018ff479fb4771795c568c167c03 SHA-256: 34e93c0af0b37340a6a639210fcca98980a7e49be0b4bdc650a7ff4c99e1bb6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f931b5d3---niwepapemanal.pdf In PDF document text
    • https://yifff.se/userfiles/file/jusadunobirow.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/78185165347.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/33941357168.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/26496330834.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/denitagabuvibuk.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46817431840.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/pujuv.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145644ad2133---56969625559.pdfIn PDF document text
    • http://metapolar.hu/tmp/53279402670.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b67a0ae7acb89eb9e375edec2b433c7/50965292664.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210916_060038.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/danomupodalobeti.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lovizanuzavunigakimasa.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/disupipakase.pdfIn PDF document text
    • http://zerosquareonline.com/file/jukosozunakijaxiwixusive.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1710ecfbacf4eb667f19abe328e101e2/vubedekelalapada.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/lerufonexo.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/miparobotenelebarunedonab.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79470930137.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xarewivapamejawub.pdfIn PDF document text
    • http://clingac.com/d/files/64332619588.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/26855557772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=self+hypnosis+pdfPDF link annotation
    • 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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 10424 bytes
SHA-256: cae293778f443854c7ae94a7d18c287b7c846a3b08302f081eb0a37b5f9094b8
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 17556 bytes
SHA-256: 6feeb13c18c3db53e45e2a685002211cca88781ebd3714eaf6b7ef6e4117dff4
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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