Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cecacf86b8791ce…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 384eda6b9d2969bfeb21911ce6acde33 SHA-1: d9dd09583774e9da0d39b1f9e6f2058088655e7e SHA-256: 8cecacf86b8791cec3ae8650bde1630d11a4134d138bf193103e7d2b2a4b845a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=rain+man+penguin+readers+level+3+pdf PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/97pakahh15tjav11e74q5dffse/dujagewo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079398430366---punuvobuzuw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/limosebenifofewafojajizib.pdfIn PDF document text
    • https://telorgabus.com/contents/files/16473268456.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s73ikcahkpe5tr88ggg2e2uftj/17729800029.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d51927497b136a505577d23b11038476/nubaginutebozoxe.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rn2et0jo9hgujdhd65dq7rcsu3/lobixe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tbf0ru324jpqkk0juoijq95n7/34702686497.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ed72a7b5---52806246226.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/wonimepuxatuzonuwulidun.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/takubedufudoj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/213bb7892752b125b0d8d6cc80f616df/72385233619.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/23419774593.pdfIn PDF document text
    • http://twilaw.com/files/files/29612870599.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/41118012916.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/90367804910.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/15741054965.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/th2v676hbrfhi88kv9h7qp7uud/86759617065.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/mabatokojejudezi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1a396dd4---dumixasidamixakezaw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d12f43613---vimugetazilujapiku.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f21c45e9f---musiw.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/pajireraginejawo.pdfIn PDF document text
    • 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 18580 bytes
SHA-256: 67490f7073571d62b3ab54622afefdcc68eabfa204e358dd41b9617ca8208b18
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 11008 bytes
SHA-256: 294a4f714d31b6d28c3b2ea555dd381bf82af5d3136e7aba4fd612243e95166d

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