Malicious PDF — malware analysis report

Static analysis result for SHA-256 b004c3ac391dfc89…

MALICIOUS

PDF

73.2 KB Created: 2021-08-30 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28dde0cffeac266e4cc49f8ac490d6dc SHA-1: 830bdc1cb02e1c39721970dc2ecec25985d8561e SHA-256: b004c3ac391dfc89949d3a4fa222fac3ef92d5017d8b208f798c9850eecff182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f2e034e4---20478385043.pdf In PDF document text
    • http://cleangroupbd.com/ck/upload/files/lanurumovototudegozonofuw.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/65f9caf61f091a2bc0794fb96748450e/vusonibiwanux.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/eff4213f4a1dbf0bc214dc3fd42847e1/58655478915.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102c1c26e736---zetakaratinopirugipozor.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e293387af89ee440aa65e540700d2092/gegosojirak.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gubejuremujadavitegox.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/6020252519.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/tuwemewarobirapo.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/60716612183.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d14cbef7e30d9a9e4ffe1e5874723b9a/1156241907.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/tafofidajipikafakulasugeg.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ra69fg02l5emppk3s27r3v9us1/notatu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o1jldh1ees4036mqmlbtaolo5/nanusazaweguxotifaz.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8f7394a3d0f912c4ca4c8d567ce0b578/59024197780.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d5a85bc21cb942399540acce93f6a968/ragir.pdfIn PDF document text
    • http://df-2.de/images/daten/file/15214445465.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/63137012265.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/61319210672.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tagilejavuwax.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/91d3c76dd196461ed707d2024dc2dc26/nazexaxagirivudese.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ee54fd46ecf8707d8a3d5734da0bbc1/1008619676.pdfIn PDF document text
    • https://epiphanych.com/images/file/wefixawukodaregibu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/50733022858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+rap+more+clearlyPDF 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_off0000bdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 16720 bytes
SHA-256: 48deda3f806e0df7be9f5876ce7c6d402856b52d648a0e571da92f9086d12378
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10364 bytes
SHA-256: 48d06d8abc7999f9fe6ef2827f7542347a7448b817a5592bc39a77a3db035444