Malicious PDF — malware analysis report

Static analysis result for SHA-256 2500186e75fe12e4…

MALICIOUS

PDF

86.2 KB Created: 2021-08-01 13:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 353719a75fe366838d1cfca482929960 SHA-1: 1a265501170cf2326cbbb30500ea27830b159fb6 SHA-256: 2500186e75fe12e48f69303425ca9caf9836a13dd73d84ad7a3f927300e85fd8
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nieruchomosci-swidnica.pl/userfiles/file/28793602309.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a52618491---kosetaviwa.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/zunawulelokuz.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/joruji.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/kasedozeregavud.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/85794249107.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8unss8t57kpcbhrkrbvrq2mje1/1444597222.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wixizabo.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/sodovezejalabuwefime.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/45503877105.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5de50b692---69356011945.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c62c2e0f23bd4d07aead98f6f5111625/58434569842.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/79804819558.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/lajova.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/77526814380.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f921c984a42---kewosiwusopitozovewo.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/kefivap.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/67956705430.pdfIn PDF document text
    • https://protrialse.eu/files/files/lujetezixogukar.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2ab43f8c80096615166805f9cc7e2572/noxijaki.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/mabemexemuketa.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/16750575611.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a8llq5pg5or2u0lrf7ojih5374/69187799988.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2cc5d0183---78118925817.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d440e584---vozerisimadadi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/69245446876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+store+uncooked+meat+in+fridgePDF 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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 11040 bytes
SHA-256: 0fcb1241d40667be6918347a75b2ffbcf929ce35b9f60ebfdfaf3b40fd1cc4ba
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 16832 bytes
SHA-256: 4e687f8a06f2968313e12207322a848b947f5feaf1611b7706606e6ddd5e8535