Malicious PDF — malware analysis report

Static analysis result for SHA-256 de617d7a81fa1f67…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 21:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d99ba331b5885bd021abadd6da9f94 SHA-1: 92bb6e91485df15f1d71c862d9504abd3bf059eb SHA-256: de617d7a81fa1f67ed47fa757146a44a4413f393d42320cd42cebc58ed665b12
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

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://geo-equipe.it/userfiles/files/fedugalopedanirezudakogo.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zaxabukirexaduwamubi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910175306.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/buvukomizu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/37456049060.pdfIn PDF document text
    • https://mollis.rs/files/88955950484.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/95606669174.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/padilifofevuvaguba.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/35349046321.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/94291265601.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/5964436896.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/88426792576.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/subovamotelirub.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/fogaxap.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8e7e5f18---ritadomafezoxuberidobivid.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/29245116531.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/wirefabew.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d4a71025---vosifidat.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b2ba1c9264cf49256008f7f3b91d18de/ribogolorapijirasaxowal.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/55581449510.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/pelilumasiled.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/xudebojira.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66228796983.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kuxosex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hidden+apk+files+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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 10476 bytes
SHA-256: 3dce672b3ba96aeb7d84bd29067d3611884f0229c4aca6d2b08f8c3396f7e8ea
font_02_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 18720 bytes
SHA-256: 44773740590fbcdd25a29a4224cd9b24aeb623bbdac9226e819922a821c1277f

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