Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84999e65fe3edc…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 03:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1eb82c96411c5a85913d45213baa337 SHA-1: 961d546ed065aa8bd7e2f7f24c22e9fa14f5e8fc SHA-256: bc84999e65fe3edcdad111e8c81ee33a81ae2c2dc1cf6439c40dbcf99ea7e5f9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/39204289634.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd726c597b2---60998565760.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/sarezakoregibuwosud.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/koor1nce29in1ftf0npgi08k2p/37265483074.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871a6d08a2a---93462130387.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/11562734375.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ed5b18f1---vefosirejuxenisen.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082683509f70---bofesadofofelatirupoguk.pdfIn PDF document text
    • http://yoron.net/up/files/73261583976.pdfIn PDF document text
    • https://bamor.org/userfiles/file/55480658757.pdfIn PDF document text
    • https://partnermind.cz/images/files/47444716891.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/270634142531622337509.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/36586275.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/fazosuw.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/cdec92adad2e012105d48fd66a57ee3c/vujevo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/nexofubatiwegadav.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5smj9nkj12gvuhae8g5ek2qhv1/mamakamivejigasenubifiza.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/dujikepopadudasana.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/dezewamojajo.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/kerazomid.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/difulefefesireritu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lqgngnh9md8lob9490fis7pd85/50233256661.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/pafuzexedapadevu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd722bf44---67407518113.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610808ac4243b---14618874768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vaillant+vrt+340f+manual+downloadPDF 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_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 10808 bytes
SHA-256: eb6e68f77a9a7948dc73498ada93837cc8b976e913edc678a427ec65b20a1dfe
font_02_sfnt_off0001411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 19064 bytes
SHA-256: bc700153bbcd2cd0d477c21143cb03d163b1e7a33dc433b4903aceb6ee7655e2