Malicious PDF — malware analysis report

Static analysis result for SHA-256 058afaf39d67dbf3…

MALICIOUS

PDF

74.9 KB Created: 2021-06-24 23:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d678aff2dc59dd875c24d3b4d57ec23 SHA-1: 8f2d80608c7ba315f027df4477bf02b20ff8d9e7 SHA-256: 058afaf39d67dbf3f93f2e90f61dc41306d18ef03c1da9dca4ec73c263657027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body's obfuscated nature and the presence of numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=alup+air+control+1+manual
    • http://www.toptehnik.si/images/18770404268.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430050436811174.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c10c57732---81449819380.pdf
    • http://dermaktif.com/imgup/file/moxibojezarafen.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/894fb9d1fe2d7e930a2f1bbaf536e702/dadijepitun.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/691993328215daa502b9fafa5a35320c/30891517505.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/684e0908b420830825a8c0a733318879/bezoj.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d08f105e2---levilawi.pdf
    • http://shriadinathbank.com/uploads/jadegegi.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/94a156615f5b6be4081c18ef7ebb4311/49493090673.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04a1ac65e9b68b06a39d9dc56163b8bc/99324552039.pdf
    • http://gazosilikatnn.ru/uploads/files/32852006650.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2bd4e28f---88478045026.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/bc5bb5481f78e2c0ded64972a4bbe110/76109340739.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/pewovatinipufugak.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106030117255375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin
d1220265a74e5724f5cbedee7853ebbf88371a17f8ebb34323222e6d9404011b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 4704 bytes
font_01_sfnt_off0000ea60.bin
12d27d487ee905f21040bdac871fc3f20d6894fbbb6d3bc2fd54a6cb31b707e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 12116 bytes
font_02_sfnt_off0001123e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 4324 bytes

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