Malicious PDF — malware analysis report

Static analysis result for SHA-256 e282723614bc1a31…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 15:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9da85c07474a93f19af9d5c8f2c28bbe SHA-1: ee69559b9870d5214351cef8b70918d46fd93889 SHA-256: e282723614bc1a31082b157e5fb3ee1a80dc16375937ba906744e251bbfec501
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs suggest an attempt to download further malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=questions+structure+in+english+pdf PDF link annotation
    • http://tiendanatacion.com/noticias/files/tuxezifivuw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/63csjou25qha8jabt6r55jb282/76775994785.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6ab7ac61a---monowiwikadikapikomosel.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/rivovesokelajetalabelowuw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6c858959---jusulevupukexag.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/pitake.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/daguvuwevawowul.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/tubewuke.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91494791473.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa362f87ee2---topuzefomoripo.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/19818623802.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b965cd98b002707d0b2e994556645be1/liraguzolotesana.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1khsj739urklilfg5eg7ap6cf5/97530623143.pdfIn PDF document text
    • http://liyangah.com/Upload/file/najumu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivarutuvew.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607167ec7b5ce---10961532431.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610556ad3b803---tajivaj.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/peratakarerusirerisu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcbab1bc0---kexojeroguginiv.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/pujuk.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/33891055098.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4abc9p7eomplolvm3u3bm7o8ji/pirun.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 16236 bytes
SHA-256: 50e13c69670da6cd2f711261de1a8bc05246b998e503bd5f9001334c045020a1
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 10896 bytes
SHA-256: 0d5a64845d92eebf510f3859d4a31b27e0fc06995196bd84f86912b5f08831be

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