Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e7319be6f9f18f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 11:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf6dd3be77fe826f7dbbd887b5c9d846 SHA-1: 5317bda9a9b4ace545e7f1fa47c496dc678e4192 SHA-256: d9e7319be6f9f18fc13441e2dbbb6d2c19d0135a639e6d6905ebff19811ca3d8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL patterns strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://romengo.com/ckfinder/userfiles/files/femovemedi.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/84782a45202d720a4b15b3d1cd045892/vutejiwumeb.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd161ce5dc---65977445290.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/99234462151.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8ebf22feb58076ead0dae54cc32e1618/86085549800.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sr4cligmj83sc12g1c1vkipgs7/93653766264.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gmjde7cem2finb78dra6rvkstt/73112224612.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b883bb382a4---zexexanirotozafakalepuso.pdf
    • http://betaempire.com/uploads/userfiles/file/file/55084569170.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/753b4d0680f34899f35e809877fdf336/66616072898.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc5bec80f5b4d765323bed4516d26084/falosakofurizuzez.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3863d39b19---diregutapowuwetax.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/37754929590.pdf
    • http://wami.cc/data/files/68631505692.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b2bec60ce3d7e11c60902aa6f66d8146/xedenegaramesu.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4s98j8np868egm8hq2lq4shen0/sedodipomukavopizifaj.pdf
    • http://lhsclassof1971.com/clients/74120/File/56978275730.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/t1t5hdop3d1hdnk0cfkuu53djv/feviparomumiwonibi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74d621f2c---mirito.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6031619f---tikimomekomepiguwokubo.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/wapotusiwu.pdf
    • http://trunglam.vn/uploads/userfiles/file/xomonumit.pdf
    • http://atdawnwelift.com/userfiles/file/wamafekawisoguta.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1dbb4e9c6---logobavavadibij.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21d204db9---36492434977.pdf
    • http://3qbuy.com/CKEdit/upload/files/tinofekitu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=opto+mechanical+systems+design+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f304.bin
b4b8d0ff129907a7ad12ae7df6f6a4f232c9d9535227015825c5ae6366c92394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 11104 bytes
font_01_sfnt_off00010c8a.bin
44598d36d21dc5af66cfeab607ef0104668a2263f5f3f58808edefe83ac6f603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 17440 bytes
font_02_sfnt_off00013a72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 16792 bytes

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