Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950f3c39a9ff14e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 09:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79f2999dc6d14a887e9c28bb2685e08e SHA-1: 219b3cd4c09cb83475b23fa9d9932b5bd985a0a5 SHA-256: a950f3c39a9ff14e734006693b6043ab2273f878f88f50ca2b55e5c8f1b2eeff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c97b4b4a7f5dc03c32f45030a2bb3db5/22047290502.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3af9ec9cc881d2fa59f8559ea7653c0b/75904769876.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2244e8911f---67423455363.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9aa0db90ab014be50dd71e3e5794a3ca/48287743570.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915a06a1dc---lefoxadebutipes.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e680d6d4e---gegupifubizofaduso.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/nebabemukukopividameju.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/67004386122.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/69027613315.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/gobujazuno.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0cntnr2eqti6hm455cfuu07ob8/natezunukisa.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f4548c1386a2f7bb9e4353f8227ec772/23748217059.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eaf1b2df3---72812683792.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/97a50c6e55c1ae218cca87258538842b/23154785478.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/97728210939.pdfIn PDF document text
    • https://abeess.com/userfiles/file/76443201452.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74ef2cde15---luxosolepebijarudus.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d054d65a74e3b9c6578ff9e0c2f97d94/rozafozu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b459e7938ab---71561993839.pdfIn PDF document text
    • http://davcpundri.com/css/file/11252967660.pdfIn PDF document text
    • http://classtool.info/upload/files/xafozepujabiwupugagu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6532852dba92bcffc66494e1232f69f3/88446210353.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/73653603678.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/216aea4dfbb48e0ede06cf9d3b84e4f2/21273061605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+love+game+emma+hartPDF 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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 10220 bytes
SHA-256: 237f0caf60fba068f236b49d2b8d4aa87ddcdfaa125085a1ff9a7ca553a0a872
font_02_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 17368 bytes
SHA-256: 21ebb87a1df85e46f2a00223100320d75919e20be5c4277230e94a92f15660aa