Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b29e4f62c9becd…

MALICIOUS

PDF

85.3 KB Created: 2021-08-05 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf0b38da60c668e0e9136db0d0932d7b SHA-1: 0f79a90b84c233a920e30b218d664f788aa2d4b6 SHA-256: 78b29e4f62c9becdc275edf31238fe0046860bfde3417120b4c419e4187abb03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/73559254019.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e52c6a351f35a51eb9fef8659a06c911/59974109964.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/xipazalor.pdfIn PDF document text
    • http://matras-devison.com/upload/file/63210621349.pdfIn PDF document text
    • http://kezmosas.hu/files/file/89906172116.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/boresutukawibeba.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/82949967799.pdfIn PDF document text
    • https://drsaman.com/files/vimetiremazeforurujipulej.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/51234753053.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/917098bbe7969ac2ece109b1a0fd1bf2/kagazavasowijutezede.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c631a614b---xudemapemogusegisami.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/ditejitumezokisalosigej.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/julefumovabilexawe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46d4a61b0e5f9e9270fdab19977504dd/34649037515.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/5582469809.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/93500990436.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/ponetamusixusujiz.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d20d7ee6e82047bca4bfbb8b1df52f1d/mewudepe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jrle368iqj8dh1tnevo34m8vd0/10659506848.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/33703087008.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/a8a798517d3d43cce4a31a8eaf279eab/62804811482.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/40145910417.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/padalugusiliginupom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+vehicle+number+using+engine+numberPDF 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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16636 bytes
SHA-256: 0c0205c531302cef51b2530e50d5b8d2204064f89d1237745d252e3b0dc90311
font_01_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 11144 bytes
SHA-256: c00b0920cc4dd69c71e840dc38a489b213717f21ef05837b9e6d078623947fcf
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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