Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61cba1c6e69c4ad…

MALICIOUS

PDF

71.2 KB Created: 2021-06-29 19:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 484422bf6fb9ae2763d6e4b36a3f4b10 SHA-1: bf554ac24e2b1fdbc009bb35dd640be5cc41a5d6 SHA-256: f61cba1c6e69c4adb01e3f93bb34d8e0037cdb155f6f0ba11709015f8c186da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to various compromised WordPress sites and potentially malicious URLs, such as 'https://allytemp.ru/uplcv?utm_term=how+many+pints+are+in+48+ounces'. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate attempt to obscure the final destination and leverage disposable hosting for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=how+many+pints+are+in+48+ounces PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2a923b50ae2c730d895b344505473bc0/vapujofujokesebilid.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/12016121494.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/71qcqh6pdgo150cht5r2vbblf4/46306736003.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/53474414609.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rs782tahe7mgcfpi75suqtoim4/desawolituwodive.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6f722d5c565d491b3558e568deb806c3/27012073899.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42fc69693---57065046770.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c372bf869b1---59867366454.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a6a3cbe36d64d78f5c664ac259d30a5/16148255324.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a591527335---54248921683.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/9114556688.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/wemupovojoxopup.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bfbd5d0ad519072d1039471e1f266bfc/lipovabofepozubajo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93312db987---wivuralepu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/8ead2cf555179dbf89ba7b1ddbd4b46b/gefazevafukosenir.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/puvelatateguzalugesolek.pdfIn PDF document text
    • http://lucann.com/Upload/file/nejik.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/pifanepima.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e78bb4ada1e47b9a03aa3bafe040142d/libimaluwotagudazidob.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/10985792455.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/bovonafujenoneraxukuzuk.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/pejowerovodibololimonuvod.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 15028 bytes
SHA-256: 94bd3fd65e5d63bac1f3817372fdad81c4253395cf26d3cc5a0229f3e4382026
font_02_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 11064 bytes
SHA-256: a3a3371f7965a5b8ea946f66a9a61380988a604a234fedb0cd22012780560b03

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