Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ffaf439304866a…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 19:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 516ae3b26021d186090e623d98b824a4 SHA-1: 7c51ff0bd30d0d3e246ad806910daae393337bae SHA-256: a4ffaf439304866a6a513f4ba035042473f08e106808f343ea691727d6f3ed4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://exam10.menapoint.com/app/webroot/upload/files/51885624192.pdf In PDF document text
    • https://www.mds-horizons.com/upload/files/kamejusolalilabijopudonid.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kumevexi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf13cd5239a---96602188710.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/wifuvusivilodofasav.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dujetikibon.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jifunuma.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1429878fdcbd6b2ae82b68dc00b947d8/todapilobedeti.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/fatatuferupe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f81091a571b4c28fe0eb01aaa4d48c90/73746867474.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea7bfb76---rikugenotalamof.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/48677565522.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cc1cc549---bawutozeranokosevu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/12058007548.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c030e756b4e---rubogovikiduluja.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xogazeruwanifolavevan.pdfIn PDF document text
    • http://afro-safari.com/upload/files/37373518761.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/40590229372.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9q3fna92844cf2404v037d0m4k/bixufegumimatek.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fe9ab992---revenasasenap.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16104e838dd9c9---rategivesexabetinejumofug.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee1c32b98---fimakozine.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbd4578726---90012721271.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ec60a312---jixizixinasebutodukod.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/14347726469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=empowerment+and+poverty+reduction+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_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 18172 bytes
SHA-256: d9db2502dd312e46a6662ed1c42d78e273103c9ce0ee4956dddcbda8af8425ec
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 10916 bytes
SHA-256: 668357bb1b3f7a0041f14cf9c0e9424b3e1e7d41e99ee5104801437d6aea533d
font_02_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1