Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e1b4cea3c00292…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 07:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 394145c204376c86291dea506cd00bea SHA-1: c8b1ea02a35906afe6f94603bcf0beef8cff0fd5 SHA-256: 81e1b4cea3c00292748e126dafd43f97bcd6580a6092359b1cc4eed8343d1220
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of multiple URLs hosted on compromised CMS uploads suggests a phishing or malware distribution campaign.

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c10b9192414---pagixigiru.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o70r2t7s0cj38cmrqrbumj8is2/tututirobokuvorosiwefopef.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a56ab238b419643d4bed925fc1437c3e/86373230109.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac378f30fb---66427374879.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gi0rfdh5s2eqf1hl23ln01j8a7/16803969477.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f13e690b---mavonisav.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf0b1b4d1---gofudixuvevukusab.pdfIn PDF document text
    • http://ge-mak.com/files/vaxopuvu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609587317b55f---pazezidazavake.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4949cda4aa7a7aa4120a17c1804007df/17257495271.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kumabejab.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc70e68d9b---1046483107.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ff8aa174e028fafe566e0be898149fb8/42893959546.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6502ebb6b---kokubolekotavabawozeg.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141125552012.pdfIn PDF document text
    • http://renovator.cz/files/file/fidebed.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d510f5ef99a---jugefokero.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/guwebupesetuxege.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e1710ff1b---sitav.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/42u1rru71huiis9aibhl1rcdua/xajusedirufowidofi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/pekaxiferujamovoxogutuval.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f2923438---jepepubaniwefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redirected+page+has+no+incoming+internal+linksPDF 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_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16872 bytes
SHA-256: 6cbc1c5401d1c3311e791e6ff7b8eb42ac74d251517dbcc6ce760595ffd26707
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 11096 bytes
SHA-256: f6c3441050bfd6c4e8af90e95bbb1bfeedf44a73c7b76dab714ae98017bcfeef
font_02_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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