Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bac3e5771075a3…

MALICIOUS

PDF

85.8 KB Created: 2021-08-22 00:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e806d477805679e577d5d60f145c1007 SHA-1: f27a818dfa0b9320e67d59fa10dc6d48fc03f7a0 SHA-256: d6bac3e5771075a3d77053ee52bfb27c1eb6df4cf0a598fed5e296fec427685e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. The presence of multiple links to potentially malicious PDF files suggests a campaign to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b363885e25---85195608425.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64359c196e---vunufisoruvagasodofogex.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/zigov.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a3f8634a2---40192166923.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096bca3e31df---51703802799.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e90bab9557fe547fa3af83786e5d146/76833585560.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da710131287---1609059542.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/retisug.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/50420669454.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/8829475869.pdfIn PDF document text
    • https://arerp.kr/data/file///60935708160.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/68423858529.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa367631d3---xirujas.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/lewubivemikupi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/25klchgkv2q6sq02mkioc4v393/xujirewes.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vibamotaguwuxu.pdfIn PDF document text
    • http://drironcat.com/images/file/sofozevanotavasami.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/41295401439.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608007dba5570---73790322905.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/57927218535.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d15b2690e---soxonopudalafodipotogidi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vepimatemovunapilofaresel.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/14b99c2cee9539b19e31f5ad7eec0949/85000405221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=printable+calendar+2021+may+freePDF 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 16560 bytes
SHA-256: e122f54b18094608871f2c9db4263353bf86a07b7e835a06d3aff66bbdb869f7
font_01_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F93 10896 bytes
SHA-256: f6736afa8539d9c27f611a759dbb3e86f5a664568cf9dc19f60643f83e2c5f9e

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