Malicious PDF — malware analysis report

Static analysis result for SHA-256 4126f4c294cc4921…

MALICIOUS

PDF

80.9 KB Created: 2021-07-29 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ac93c0e08a1d6d367bb2e2b8b06ac5e SHA-1: 1fc1215323eb4c438b1f29512a50855af3fa086a SHA-256: 4126f4c294cc4921598fbe46df5b7b6e39532540a9baf62b06c67bb50527f837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099788a28aa9---tewutovudodo.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/68152a8d03b16499c80c492c84d7e989/mokirasarigalodaru.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607555bca6942---78415417173.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fasux.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba24aac48d116f3c84e8af286a5d2744/63637040954.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/93610749068.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/nenixelokopetadu.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210704_75ECD95C3DC45752.pdfIn PDF document text
    • https://menu2uplus.com/images/file/bixupam.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wizodibu.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/nirakoxotaxegesuf.pdfIn PDF document text
    • http://proxima-design.cz/files/file/3290677268.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/romitisazipewunuje.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/52080538437.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/577cc652e30e11f72d97d1abc83feb02/41198406349.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/renobupikilagetipoli.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d6bb041495208db4790fac8831fc3f7d/63865848441.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f642c1b1b6---63108938012.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zizidipejuzubufojajisu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099788a28aa9---tewutovudodo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2443307d26cf55c4577aaa1a265b4a24/puwudisugowozafosusesozod.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/99023998866.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8aa34b5f---gonino.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160862df311795---fodigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+check+old+amber+alertsPDF 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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10748 bytes
SHA-256: 94cf92e53b05cfc888f68ed4b836a66a62e20838f67aee29f074a5117ab20b09
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16704 bytes
SHA-256: a7cbc69f472324e80316f030e3e4a055ee0d930a20e79667149e6f1e136b0e77

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