Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61d1713b9f7a753…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 13:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b5a1e1a122c9ed702427e953f76a92f SHA-1: 02fea702667ce573f947c09f5778c12c4412156d SHA-256: c61d1713b9f7a753cb53ef2c171572644a1fe179e0fdbb8f98dbe903dfd0b04b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chi-kara.net/Upload/files/41925304305.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711318b617---jodoxilara.pdfIn PDF document text
    • http://machin.kr/userData/board/file/tisudobamiloviba.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vibokomivakolilisogakad.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/79643069592.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/melov.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/dejumuxorew.pdfIn PDF document text
    • https://majubesar.com/contents/files/satovodapemofukotoja.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/97003421415.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/roxokes.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xunowoperu.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/6777539591.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/xejotabafeduzu.pdfIn PDF document text
    • http://nature-revive.org/files/file/xofuxatufeporivezo.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/5433125049.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f741c0cdbeb09686df5e54a22e7e6740/80863764678.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/52531662103.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/80339520917.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dawufasivemasuteferi.pdfIn PDF document text
    • http://tecksco.com/upload/files/tovazenuriton.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/50289038817.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd947f25---wozijotize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+gta+v+mobile+downloadPDF 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10608 bytes
SHA-256: c490e265294429779362b2db8d9ca939b3c78af2b75903cbfde0393ad2397beb
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 17176 bytes
SHA-256: 1c841c7aad2dbf76e65760f77fcf2dcbfd8ce4375e76e97e04dc0931aa2084c5
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1