Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf67a74ada494c07…

MALICIOUS

PDF

76.9 KB Created: 2021-09-28 13:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86fafe4f7ee43da9dcbe5b4bd7e64e3a SHA-1: 45bd6e991a69944aa2e10b5ade74169559aa6d65 SHA-256: cf67a74ada494c07be32e84618af15879d14c46851f987db6d18cebe0ec5eefa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=ios+android+icon PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fcce1625---65589136420.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/91464040143.pdfIn PDF document text
    • http://newshop.jp/archive/file/58666192312.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/1430276611.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/43275542883.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sawawu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079176fc0c---88315305475.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/50025270448.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lisura.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9c54822bc65c0cc98689bac52af30ec6/99213050537.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d954b1e---fofupuvaxemurovusavo.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lemebapakipomif.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341536ee6d6---midewuxo.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041428183849.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/96109689718.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145db63a1e70---buniridowetikafuwuxari.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/50421199025.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/89872323033.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/25908351076.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec4jccv9knriec1ulodvtvmf12/26745249544.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/42375238132.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210917190354.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfdf1299cb---12891485834.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10036 bytes
SHA-256: ec040a2d6878095ade6d0b8bdf33d064e8d89ad7ff5a5818d2bfced83f1fcf6d
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 20656 bytes
SHA-256: 4c25787441242b9c9009ea4407c4bf724d11b606144b71196254444137a02b44

Open this report in the interactive analyzer, or submit your own file for analysis.