Malicious PDF — malware analysis report

Static analysis result for SHA-256 1085d61d9bbe12dd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 02:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e52ec79d7131c8aadd588d305ed149ed SHA-1: 59f6eda00370d70954fd37e2471fbcdecd10f678 SHA-256: 1085d61d9bbe12dd4e17d62cbd48847567286db0fcdf0fa492a9581ea70a4a27
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on domains identified as potentially compromised or disposable, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://enjoyisagenix.com/ckfinder/userfiles/files/genalowisisonofufexow.pdf In PDF document text
    • http://filippodelvita.com/demo/userfiles/file/navenitopowowiwugapiwav.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/64691709847.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/63031537378.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/78331497799.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/fewasap.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/36521683935.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0efdffff---jutilolagomojufatafasin.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d4c1c57---18135931107.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zapevapav.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/nuwomisexo.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/sobalesabozonej.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ketisivevuwobolusukut.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/33710115337.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/42163060900.pdfIn PDF document text
    • http://iccarrentals.com/files/file/jabezogiviwuw.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nefavegexovekekurotut.pdfIn PDF document text
    • http://hoachattn.com/image/files/9569134991.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/16267095874.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/23809203580.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/11692712534.pdfIn PDF document text
    • http://cy2hand.com/userfiles/48006090357.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/18557397218.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c041061583---metupabikivokejuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spin+master+game+apkPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 17504 bytes
SHA-256: b2b7c1ab115d5385f1edfff57d0e728981e4c5907f89bf39f57d97a02e1f3c4a
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10596 bytes
SHA-256: 58ab72a0090ab208be93a51b8432a5ec82c7f602a08fcba913ed2cb960995654
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1