Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b6bcae29bcf610…

MALICIOUS

PDF

91.4 KB Created: 2021-07-03 22:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a22c8ca3edd24525dfe77bdf1513f608 SHA-1: 9ab9a4f21556c3e69322fcfba5dda2631056261c SHA-256: b3b6bcae29bcf6103481dd2286f48640260c07fb0749553da0a6ce5128b2c3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised websites, likely serving as a distribution mechanism for further malicious content. The presence of numerous URLs on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection. No scripts were extracted from this sample, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/265c0qkaa9ut0rfu0fehf6dpvv/jogorapaj.pdf In PDF document text
    • http://candientushinko.com/images/file/tenonopifugo.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/43468884825.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42743562245.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f71a794f08a71ee90441c7ed42c986f0/23749360304.pdfIn PDF document text
    • https://iltuosarto.com/file/gopomu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6dddad7572816d7af38498d269360d93/golum.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f64e9cf721a00d7121dab88b5b0ea8f/vemotexufarujofoxudo.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/lanakujomijofuzosax.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/zinuwumeridomut.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/25773595866.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ft52q020apm7m2oir2jdo3vbt5/poburi.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/mutinavefinasononepiwe.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/87363061784.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa31452a3c---sanepupomonobesinagelure.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dc6b0bcdn90sn2vnn8e5j5rqgi/pugafimopisoxinagoxam.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7ed204a6dd5117077ddea48f0b31817b/22540187798.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/84f4ded858b2cce9b22129f364baf35b/rasezuwitesoxiluxatozakot.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/f92c4a35f78baf554215608893e3caf5/57685239200.pdfIn PDF document text
    • https://mattress-leader.com/media/74281486481.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1c2268ea1f301a8be3affb1a8b34d205/bifawak.pdfIn PDF document text
    • http://nfc.soo.jp/file/58103681410.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb88c70f8---81148223144.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965c62f35---jebuvubopu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s1su24m5g26statk3nngqlnsia/mikuwerufejetabapenujumij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=they+are+playingPDF 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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10220 bytes
SHA-256: 2edc6a6b978159708531ca695d81772a8f156e28998fa73281f94a46faee0700
font_01_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 28948 bytes
SHA-256: 4179b89961ff07fbaf30cb227444d1fb8a4f45fd1a1af387addd4b5a9da53967
font_02_sfnt_off000146b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.