Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d7e3102c473e4c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 17:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0fa8bdca686543e9f2f7cbc31a267b29 SHA-1: 9d8cfcaefcb796cfac587b48eb72e8aad2960951 SHA-256: 17d7e3102c473e4ce8f96f6767cf828b6aafd3577a58f3fb2451f05b3c430883
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c062adfb4010408a342dadc5ead1e369/24895102100.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/70330863948.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb8ca5ff0---gitasulepovoxupovo.pdfIn PDF document text
    • http://brlairport.com/images/file/degojunula.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/11162357583.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51288fd9abbbde1fdc85ecd74c48d80c/kopimarew.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/fimobogofajura.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0ad8379af98ad390c3c6753f12f5a8c2/5044702957.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/82720220058.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/turejelagoxikoxurezidig.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hin45iiab0mcugoqn5rskf6166/vivawoxog.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kafejexixevijin.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71713547286.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10d496519---dusajode.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/76352882231.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/94917899655.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/62341602131.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/36710454884.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/93dbd12566a36345d8803cbdb28f448b/potola.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6678d77f7ae5fb247351c28064bd5714/togixodobapudasovedujeli.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cc1lsrp5qhum02kejtchjh0c9o/61002407959.pdfIn PDF document text
    • http://wernitznigg.at/files/41289245611.pdfIn PDF document text
    • http://abwrva.com/uploads/files/51270318408.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/drh06b9hm2uvrbvpaq65cb1vs6/sejulawabebotedogewufof.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0d9dae69---89371097936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+the+default+pdf+reader+on+windows+10PDF 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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 11252 bytes
SHA-256: 63f07637dfdef66f31faad5f61dc22a607a2b84210e514592b1c1efc9d271fa6
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 18672 bytes
SHA-256: 397cd2965144d1375e1b0b723886a49ea06837956ec49d1a5adba5f0250bb14b

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