Malicious PDF — malware analysis report

Static analysis result for SHA-256 341e0ea82ba2bc26…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 03:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e53b7fc44e405d3fb9796c28ae4c7a2 SHA-1: 5b2d98050516b626565f345424bf9e8dddbbdb1e SHA-256: 341e0ea82ba2bc26fa2022bf93e2743db10dc1334d333cbceb64c03e67bc1cc9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://davidhammerstein.org/userfiles/file/95485215549.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6e445d7e---pabisu.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/28294452892.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eb668dbc4---vusepakuvivopolugutol.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/89923135903.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0f5f161c---76957023534.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gopufajakiveve.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160722dd80a97f---jojazexixomom.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6b1ce3125487faf82b39b80e493d89f3/jajawixawuloj.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094905580ae6---vutoji.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/53100661313.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/sejiwubuwopifa.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/tedazodojadi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ebaac32f52eb2d0ce5b57fca31933e8d/bixepijegexerisejolobad.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/ganereguxufisopolos.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/mumulukem.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/24057252953.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb0b6f68dc4---13832844645.pdfIn PDF document text
    • http://belst.by/upload/file/83747696213.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e2fdcf697ee454fe144f80ef12ebbd21/26362776005.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/66350867690.pdfIn PDF document text
    • https://masihpt2.com/contents/files/guwamomip.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/puligugavosoduramikeso.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/00243095cbdd935e8efabf3693eba3ab/revudebekolazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=robert+lanza+beyond+biocentrism+pdfPDF 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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 18324 bytes
SHA-256: 8b8f50dda9f7a779a492c87d572636d7d457e0e96de27df46c14580d26fdc483
font_01_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 11140 bytes
SHA-256: 3ef072decc6bcea2cf4adaa2ddd3bf88652b9b1faff35fa74684c1af77f3af4a