Malicious PDF — malware analysis report

Static analysis result for SHA-256 2706b4e33c49cfd8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-26 04:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6b4b980825881f1cd5ddcf19d4d8c50 SHA-1: 467642866582ff997da9cb04c05f18fff703a3a4 SHA-256: 2706b4e33c49cfd818da7fb4a8acfd63f1fb007f5906d645b9ab7b265f8ee90b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF 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 CMS upload directories or disposable domains, suggesting 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 0.9986

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://norservis.info/files/files/wipavojafasomaxi.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160733c524cfd8---nomunowizulutugirod.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb72f25933---8306808844.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/30418388872.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5b0e924d4f5596e196787da33b2b5966/21952041397.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/3070154133.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bikaxitu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6d12dd3cb2776b6ed44a1270217746e5/lixulapijeronenevobukodup.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f0527d72d24214e6e61c87c4ab028fc/35475915763.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/barelasabumogaguduxofijoj.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/jugidupuje.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/96452246390.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b1236cb6295a2bbb66f9c448c2cb4522/dakagapazavupodomutigex.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/59663464470.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/tipesowidekekinukefaj.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pulawuj.pdfIn PDF document text
    • http://biomisszio.hu/tmp/vafupizifudunonaporasefop.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210512061220.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kukowixe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a19aea0a---29225806752.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/kaludumireruva.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/24972806476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+sur+les+droites+parall%C3%A8les+cm1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 10964 bytes
SHA-256: 086f1f25a9f9e644a887545bf1e5a71f777762e1a956fe14aa64f906f2836b5f
font_02_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 17736 bytes
SHA-256: 5f90848f5828c22bfdc7d616c3dda6de5265aeb5fce454333e1c18d699712a61

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