Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfccf5e20a112776…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 19:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: bdf8ae80c4ea12c46a6cd822d77e1990 SHA-1: 34c2f385cd89d48922aa042e8a668e123eb972d3 SHA-256: bfccf5e20a1127764e44cdf68e22f417b5aa7f85bbd61ef9bf45d01f2e4c50a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware. The presence of a 'utm_term=download' parameter in one URL further supports the lure of a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://houstoncoinshow.org/FCKeditor/file/55378191880.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ae19fab8ab20ae74f438ef4edf453a0a/zazada.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98ddb58a1---filuleganemu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/febomokumokitopobimewo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/wazatakivajik.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/64197958108.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/vibududugepalomiwa.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905131829_fvf9sa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614341e05ff4c---38448688337.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/jojubujujunudimozakebezal.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/mokuxiwoz.pdfIn PDF document text
    • http://tercovci.cz/files/file/89300334105.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/gobusezulafewabuxip.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58725673234.pdfIn PDF document text
    • http://charontrade.hu/data/file/24425659702.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ac73edc---lewusokutipebugabaxozuti.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/jemovopefewezavesek.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pokakazorija.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b45c750d59dcacbb1708202e5b4211bf/82601451085.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/dejewiganijipuvur.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/xafuselumedezafe.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/mekafumowironege.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/14400616127.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/lunogonunusiwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+aplikasi+slowmo+tiktokPDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 18356 bytes
SHA-256: 5e7cafde415c69e1009c112326e94a91971c2ec423a1712fba1d061cfa00668d
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 10500 bytes
SHA-256: 9f16f18dad48a3dbe08054daa1b22131f6c7711640d7ff5eb71253b546f19b2c