Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f34f21acdbd0ca…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 21:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0eb95249ff7e53387f8c6635f1e5eb91 SHA-1: c52496c94b2789b989d1bc238a79ec583df77c76 SHA-256: d8f34f21acdbd0ca20cbf170ea981dca0381db7072607972199dc8c5fe983e3c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical detection for 'Pdf.Phishing.Trojan'. A high-severity heuristic identified a fake CAPTCHA prompt, indicating a social engineering attempt to deceive the user. Multiple URLs were extracted, some pointing to compromised CMS uploads, suggesting the document is designed to lure users into downloading further malicious content.

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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=omegle+e+chat PDF link annotation
    • http://mylivediamondinventory.com/uploads/files/lewisenasifevefijufavorub.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/507dc44db3270025a8b5c8c2ebfbd0b7/pokigexonosorulot.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/90385642532.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/95535195847.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/17f738301e82bf77ef491f70060c67b7/96867741046.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/93241850352.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/40036029144.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db06f3a1c8---dimadili.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/28956469937.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/dodaguvozakazowizaguk.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/86652409715.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/60869329242.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mapivegelati.pdfIn PDF document text
    • http://test-immo.com/file/mamurefoxekovajin.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/fevefeloporevapafapeji.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bf1d140fe19d6464ba8b782165dedbfb/36124156052.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/nimukitodutuvum.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/56198010192.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sogotepagitofigilugo.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/78890433122.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/59356749977.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/38259716986.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 18292 bytes
SHA-256: 5b20b72398b75e2242641f2fa199bb1f9d92c6b58d3c019d18750deea8f456c0
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 10116 bytes
SHA-256: a8586353c9172d5a6b7e0028eeef267841d51a3aabe5e01f543c0438b133514e

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