Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c956564343bfaf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 17:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83ba4cf3db9a9def4736d5518c0c31ab SHA-1: 88a7244b964d1f5d537c4dd3a7d60a35347c1e85 SHA-256: b2c956564343bfafb2fae90381af773e9f05b0ae2c15efa5e6120ffb00a24007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://519pf.com/userfiles/files/topagafurowa.pdf In PDF document text
    • https://morganmethod.com/ci/userfiles/files/10941949705.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613922f3d987b---89998076013.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/kugomovarerolu.pdfIn PDF document text
    • https://successalpha.team/upload/files/96947986366.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lelezilodalovu.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/89100117288.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wegigofode.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7573b620---vewaramaxevozuromow.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/zasunit.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/72812734718.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/7918005621.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/9028454418.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/39105331793.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/ragemixafugu.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/45716984684.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f20e4fdbf17dff0179206b5759824d0d/fojuxilizudu.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/dupitakejibatuwexojivopuz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tpgbvolsuqm0ngnje52n59kgs0/71070368476.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/70417343605.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/fuxetujulimez.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/40131405832.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nivobunarirojinove.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/3564085890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+pair+bluetooth+earbuds+to+androidPDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 17664 bytes
SHA-256: 8cbba3077eec30cfece99be13594b677be98585151fe3c5dc76c719d7ebb6ac2
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 10808 bytes
SHA-256: 431505410d1255d8c59dc38cadcc4e03c46e7c8ba62d39e2235e00a5b0447a77