Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac837aa21884a0…

MALICIOUS

PDF

107.8 KB Created: 2021-07-25 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef93ad1497d85e22941a0f5f6ab48c05 SHA-1: 910bebf87fca1f2310ff73e635ef45cfbe5b19b0 SHA-256: b4ac837aa21884a08f3641bbb25c1f0534216562b0b5549953aa7e1c9bec98df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'SE_INVOICE_LURE' heuristic indicate a deceptive intent, likely to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fishtech.org/uploads/userfiles/file/file/filex.pdf In PDF document text
    • http://ohappy.org/userData/board/file/dinutuwowonux.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bc831bc67a323565d5589b4cee33f130/pepusexejutidakilomibi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8f28d71d524ea9a739048d952e9662fa/16333265015.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086553a9905c---13507394060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1db4d43b---wuxesevijawijelod.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/nekorukanox.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/94679037789.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kikupuxiviripinopope.pdfIn PDF document text
    • http://budka39.ru/files/11140775232.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c199e743f3---21699831373.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/58851467638.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/25373094441.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m6fnvdf7mtukd7dui2274u3kcb/84571991318.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed1da1d1e5---97576879758.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543beafcfb---godajemoxonobufadir.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a881e0dc5c178276564f85f6e155a54/15874257322.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0e405dcfb0a59f68c5018ab51f64c690/turarasoloxapip.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3ff9438d21f08cc8e0bc1dbd717d7b72/topatu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31130a69cc---wewuwimipeni.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/711f0c0c565d005c633195a49c3a5146/vajebunabule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=administration+of+criminal+justice+law+of+anambra+state+2010PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A7 11368 bytes
SHA-256: 9f476056cffafea9c380cc3d90aff5ded6dc1a3f336ef7831a2e672e47686c63
font_02_sfnt_off00017086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17086 18152 bytes
SHA-256: c024af511801f08769d53654937a4b611e9b026eb6cf11e611e37b3159476034

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