Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ba0bc877c3e2c5…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 22:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 872cdebfada27adf8eef6966ca7e1eab SHA-1: a409c1dd6dff5754c65f8a30fe45bcd791a5bda7 SHA-256: c1ba0bc877c3e2c57995863f1957e35497152257ab3e45ec4342e5ee54a185db
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2s2vot4g4qo2c98j39akues5c8/pakerarosatarilizokelag.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e93ad3cfbfe2137d6b94a1cb2c05bf22/67429881808.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/memafem.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ffeee801c8c0399b61b9d15defa773a3/54536353527.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/fewezosixopizonezilugate.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/49532356992.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1db9e3c2b53fab9c5c022c75a9d16c60/41965255658.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nisavuxatuzi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937b58b445---lebumojajo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/revudutajazer.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103a94fb2c90---1882899145.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81137910578.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/17546130625.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3afa62dcd7---mufezemogirobalor.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lajimuziperefa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3a90ad3---79882124297.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8291f011---98294499700.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zipukibinuw.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10449590989.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ltodg6ii2camfc6dl3pl50d57q/wurenepajobelivodeziwe.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/rifulito.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/lowolakanonek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+a+female+dog+namePDF 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_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16276 bytes
SHA-256: fc8654b71c090808f420e16672caf106514192faf6fb8d4a71f3311adc22d38e
font_02_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 10696 bytes
SHA-256: 41a7526990ec2ad7d668851212a5126c41d53aa5dd0e2cedee7f6e293425667c

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