Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac15a70cf3ee4118…

MALICIOUS

PDF

161.8 KB Created: 2021-07-07 08:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0636117930bb3a808e465d891aa46266 SHA-1: 23e0ae9e4ed5c8828bd50e3cbe2fbf48bbeac7fb SHA-256: ac15a70cf3ee41187088b1a7b11c3e85a20a88809c40519b755771e7b85ee97e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nq0m9rbtkj9jl733004qosuls3/telibijosisegis.pdf In PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/jedatiralaxunudewok.pdfIn PDF document text
    • https://beaszemin.com/files/88748022748.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aae170bc79dfa2288dc3947fecdf809e/zokinokefibep.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087375cd0d5f---96811775705.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bfp1uik7cklhbr7i4nv8554emn/88100034188.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ee2c173d940ed17789cbd6e13dde8204/kimerugiporulivatu.pdfIn PDF document text
    • https://sy-tech.eu/file/41830981732.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/sobuxapenakopexebogapit.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072c8aef3a---86374590727.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7553f4a2---99468356990.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a760ca09c1---39370125454.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b08441d041a---54249203536.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4835da82d246319759131fd7b4c03dda/wafozovevavevuvasoxare.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/34427598159.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/52688ecff3294dc5393703ef6f13e6bd/benelumudi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b6c8e8d0---87013539733.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/31753995a016084868b4ef4f09346b6e/72840420759.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515a8816---divazikuwitoguwoke.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/nihupsud6gkqg88e9dpgi7dk1j/lilovusopidal.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/59182709070.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/99120693448.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b2021a8f---10035231737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+custom+capes+in+minecraft+windows+10+edition+2020PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21307 17044 bytes
SHA-256: d2deed4925e5eea5202ca3c323f6a85743c7e255c691f6ec5a24fc548846be0d
font_02_sfnt_off00022ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AE4 19176 bytes
SHA-256: 3bbbfbd0a197bb0c380ed4445d48e9a08ed66cb63ed834e9cb18ae2bb29e0cd7
font_03_sfnt_off00025ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DDB 11388 bytes
SHA-256: 773bf023036d536779036980ea4156331d77cfd455de7e78962e7dd202e0e244

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