Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81aa269d5af3bb0…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 01:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed052b2569f59845191085acceb0e8e3 SHA-1: c4a024f27b02b151d50726d3d8728895d78990f1 SHA-256: e81aa269d5af3bb0fcea50c90232ec9987893caf1aa9da1d9287853c5c7f7f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://fallahi-sch.com/userfiles/file/pupuxitimefiw.pdf In PDF document text
    • http://arci-mp.fr/admin/File/tegumorupixilur.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7627c915912df9bf24530c70c0153c84/batopiruw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab97a1313---86919046466.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e748e790d5---46952385423.pdfIn PDF document text
    • http://planetamama.ru/files/file/vawuwo.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/75124840991.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/819804f66447176b7323e5cb0f444f3b/poxowamedusoxusatimaf.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/94343633353.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0832583f1---56489193659.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/21798725983.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///22145181272.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e28e88c449e---87384640864.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/31iv03qedjuhhaptmmqhijfqtt/95191928003.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mozopedexuridedejameseva.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107261446023649.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd40193c62e---79184915168.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/83576295908.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/27910804433.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ba2671d722b0910a48185ecd1c451a97/567048730.pdfIn PDF document text
    • https://pcetravel.com/files/file/28065901526.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/55d28a79724382bde99a13618b73e756/wudedefabediduniwa.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wefujozowaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dupont+manual+football+schedule+2019PDF 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_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 11396 bytes
SHA-256: c62244e30ba211819503d73e164be40d19c697db456a2bdcff014dcb2d0a412d
font_02_sfnt_off0001417f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417F 19060 bytes
SHA-256: 81385c9b1fe43f9674d3745a66a6383366989075e7034826025df57a147b9c9c

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