Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a1faf3707a8372…

MALICIOUS

PDF

82.4 KB Created: 2021-08-17 18:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 993165eb1a626b013205fda21dfae1bf SHA-1: 2fea1081b4db4af856de8d62bd0f2ad91cfdfd3d SHA-256: 17a1faf3707a83728f3b02fede3c598e39097ce4d7856b07e53e2218b24f1ed7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. These links likely lead to phishing pages or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d73b52ce---60461925946.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161176e6c60910---norowi.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/radetu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ebbe7129---53637880517.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e365729c---bemuwez.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b2191c131c0408041a8ecd22d6d3b88a/wifufisuxigerekulovom.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160887a2789f12---fekawabugelug.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9d8ce000d2324afe71269d0b237d1361/81847356607.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/gubitumedefewudiwusu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c560d4e0a93---14765060687.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/nemigotamatimajuripulizof.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69354b74a47499e3eb5294e39ada9f51/xitolorijapifimituta.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/80eb10ecbcaf796884a79b99a0299a0f/raruvijamivimel.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/21090636776.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ivlskqpfim2kch23o3h3skgk8d/sinaxakin.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fupigedu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/38567335321.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/70634145304.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/kinazo.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/nilutexofa.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ticc6qql5ljqbac3ulg5plfs71/84879044558.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/55231090407.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dupazikunasager.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manual+aire+acondicionado+carrier+pdf+gratisPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 18040 bytes
SHA-256: 165f633c191a3bc5055bb9e61b0a09590964239a700cfe2d58ef0bc653d2675a
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 10888 bytes
SHA-256: 77fc8def2f2d8a33b73c26640af1133764ba4cd99921663b1010599f47c310c3