Malicious PDF — malware analysis report

Static analysis result for SHA-256 50560ff40c0da0e9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 23:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e0b25cae7e00e14e0d4339552d6b161 SHA-1: 659bf2670c167725de47bd1d0b9c7bdba62b5e18 SHA-256: 50560ff40c0da0e980cfdad4c5d54d0cd1c14c76e740b153bb016c9943dc054f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://medius.sk/userfiles/file/xerusugawabaludotoli.pdf In PDF document text
    • http://vce34.ru/attachments/file/sanomasadiwitasatemoj.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/tagesevepojexonij.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fudunew.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hhon2co5tc0ute78qn7do0lj79/50975120242.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/81173150055.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/60381091127.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/41173842240.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/83651096520.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/jidavobapox.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mavivofatoma.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/96421781300.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124af23d2f18---44184006165.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611d82aab90c1---tiritutukopuvanofewite.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d27a80c0---burajodekuzawi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/d3196tccltj9bpkbu2tdb8ta3m/kabemorozexi.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/5226593362.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0fac2d4f---kobaximodilaz.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6rkmh0bidh2gce6nqsc50jrln3/16357477643.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/en6fv6v7f3cbj91289ag8i1u03/76140387236.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/gedutafofowakutepukazedad.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58f99c303---jomibosologine.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adebbd523---degemifejetefofeferototix.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe67719406c---bamudezepalefud.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501215800988396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=objectives+of+social+research+pdfPDF 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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 14700 bytes
SHA-256: fe213aaeb3c3d03756c77b80f4f28ee47736bc4d0c033182e3fc6b9a927bb9e5
font_02_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10972 bytes
SHA-256: ff69066349fe55d5f7c040e8ac29fa231fce2813e36c7024a5885613f2e7d5b6

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