Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c110c55c70912ac…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 09:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a95c909c6abaf3e7d97e7ce20ad03499 SHA-1: 2f4b85bc07acab380967ae3a09fc7edaacb08d70 SHA-256: 0c110c55c70912ac2abff30ab5e9f95258c255cd4172db110c03e0bc9f684582
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised websites or disposable hosting, often disguised as download links for media. The presence of external URIs and IP address literals further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dotcomtravelegypt.com/userfiles/files/vidatidararuj.pdf In PDF document text
    • http://c2ctrading.org/cms_upload/files/81226542073.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0b26c8d8---vaduwarikepob.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/65378973848182a6bc85f026ad4e5771/59667634034.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8bltpd46pe4ar3bbh4b02l3q9/digen.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/73744554311.pdfIn PDF document text
    • http://myredm.ru/uploads/file/regawemudugidal.pdfIn PDF document text
    • http://hrudolf.com/userfiles/85773956868.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/apufl08l8jri7kthubaoiu9h80/62364370732.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/adf0e3458c1e53b4fd4d24f9048580bb/satitepanavuvejuxu.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/6211634819.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074706bcdb0b---femimemededule.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081108584628.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/99723701680.pdfPDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ef18a0557fe99102f07df0cb897478f3/13458540455.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/141d1f01da6895d6c6cb7b050cef8e50/99275627931.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883b81105a---27387702022.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/58451364532.pdfIn PDF document text
    • http://patroha.hu/file/joxawajosifutut.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/piwefaf.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zutofaroz.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/38595949041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lion+king+movie+download+in+tamilrockersPDF 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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 10912 bytes
SHA-256: 846e25a9ff66da229c74b12b461ce37be493814d3eac8a7898508e214c0ed6b6
font_01_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 17224 bytes
SHA-256: c175b19fd17e58dac7f36c1ae50d6255cd1da6715d5bbe1de4a2320020fab66e
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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