Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4711873e6fad2a…

MALICIOUS

PDF

129.2 KB Created: 2021-06-14 04:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0128d714b59df641af9ba62112828bac SHA-1: b6d9109a6606f0d24e3104db5f5e1891f1436934 SHA-256: 9f4711873e6fad2a50d45ea1bbe97362068501a8e969423d9c73ba28ab8dfc6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=how+to+talk+to+anyone+92+little+tricks+pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/22321580c2927a1b3bad71f9217df827/ledajanuzetivaxezosovufoj.pdf
    • https://acryl-bg.com/userfiles/file/notole.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc066c08f0---3048700936.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/lukoduwogerunaramom.pdf
    • https://echipamente-scule.ro/userfiles/file/29865331075.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4d2c5f6e0ee62e2aa72c868e596e1a86/tewux.pdf
    • http://billedbutikken.dk/articlefiles/file/foxufomi.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4037aef4b0---nimufezeja.pdf
    • http://fygl.net/uploads/file/080555371912.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f9daa38---famamepadilonepufidijux.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1d6c06037---vetoselenuroropis.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af70ca3564---kanudatapiramomuxanako.pdf
    • http://abnicum.com/files/file/mipefap.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9672d873---zimezegofimigogerudawemoj.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2fcd6bf5---pidibaxipunawuz.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a5s1k86lte7qt6o1jdq8nduhba/92249542715.pdf
    • https://abofahed.com/userfiles/file/83536811731.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/92fe3a4cdf400844e62bf187fc3f5935/javaxikoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018506.bin
61dff8ddcde20c3f4a0c3fe94898d2eb7647c45f35a184f4a1fefcd356d00274
pdf-font-stream PDF embedded font (sfnt) at offset 0x18506 5444 bytes
font_01_sfnt_off000197ab.bin
78f909f8e86f22bde5344de0d126422994efcf7a2823032fc233ecd2a44f6c26
pdf-font-stream PDF embedded font (sfnt) at offset 0x197AB 10752 bytes
font_02_sfnt_off0001bc4d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC4D 4324 bytes
font_03_sfnt_off0001ca4e.bin
458870827904cbab3296135661b98998cc3f52a738b64d4a1013db17fdf9b1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA4E 16116 bytes