Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03409a9ef274543…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08c7d0ad367dbdbb9769a177b9a2a5fc SHA-1: 8916fa7840cb99958bb11ab95f147bc42c152a16 SHA-256: f03409a9ef274543bc7a918948cbf6add581c709c16f8f8a332a3cc00f5efefd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to various URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=olympus+tough+tg-5+manual PDF link annotation
    • https://iqmuseum.mn/uploads/files/56100830193.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tukakobaravet.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108242129221978.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/fikukekago.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/movodudi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f2003006a7---87587406965.pdfIn PDF document text
    • https://aashianarealty.com/file/75360238067.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd289be8d---bipesak.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/gubasatoso.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099485f67f29---59600059760.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8dcb8fb62442fa0920488897df5c3c0f/50178885242.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d787e961305---marowetesurelilijokare.pdfIn PDF document text
    • http://orlickachata.cz/files/files/nefaba.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/juzofisadipupunupova.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8cgef1k3010r0jbgp8qebro40e/bagovumorarorogumibom.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28618275072.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a9b8e908---gasupo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79696947b---sopomagukuxozobum.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/watototipuxololu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2ddb5461e48d58a3b5e058331990d96e/47848990715.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/45809876317.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745dc754905---soxapatimukunuten.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/37034100117.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 10780 bytes
SHA-256: 70cde48dcbc825cf01296543cc26967698c57ff160abc66cc59b713170d81af7
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 17820 bytes
SHA-256: da7d16042b555be6518093759178a1072b046b2b4fc13baea4af8d7aa8e3a0b9
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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