Malicious PDF — malware analysis report

Static analysis result for SHA-256 5434ca2ecc7b401c…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17da83874686cf48bd9ee4910366e0f4 SHA-1: 827a72b3940f65e1e0fd172e0a4b602a4917c4ea SHA-256: 5434ca2ecc7b401c93b9ea32be57ce3a7fe77ca78350e7b689d9a0f36c9a7a21
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious phishing attempt. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=sole+custody+with+visitation PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1mmg5iotdjeld1i5o7tvlq6mb5/munerozutetamitowa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5a16ac27---rexokaxibilik.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6bee3a28546e6be6a22a1c5b6efa4d1b/25722941963.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vubevizopim.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/879ca96e1b11b179c11d645d44b42719/89255409201.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/21823882836.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/79366be39f9caee710212010b030f3af/sidaleles.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3256309e---deputitumamajinunalipi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/31144896725.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881caae8f2d---ranamojif.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c422bc6acd---bunupotekurisojazepazok.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0a8f6d7185dcf9fcb4673a23c37d0b83/zilelanu.pdfIn PDF document text
    • http://belovosushi.ru/files/bosuzuzofemevi.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076edd92b11e---92221563152.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7f0e6a42cac678b8be1605c76e7fb29d/91427509644.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a8c0513d---25732376107.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nuxapibolaxiwasoke.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/64734353957.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/tajokagusosu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/befanabit.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180d069ec---vadutiwinewuzizutofegim.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d7bb64a4---30104588034.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/68530554910.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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 17016 bytes
SHA-256: 45707a426eab04543c7cf6ac42800f60fc2979133eaee8de84f733c2a6c506f1
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 10808 bytes
SHA-256: 9794775197678ea413429c881fe7577b25ff7feb9c1ebd7b7492bce1f3e484a3

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