Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad654333b8ca1347…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d8aa6b986da03f16a5f2600f76adf41 SHA-1: d8528db96b96fa56f8f2b6033c73a4088eb194dd SHA-256: ad654333b8ca13477d2c3637cfa747fb1b321adf850a2c46b733ce4a9ade22cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://asea-admin.com/_userfiles/file/20210520091747.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc0cdd921---67281227381.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/patira.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874520476c1---37970805109.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsin0h6cjeoi4rune34lg0ubg6/87496432596.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4b594e9748c355d0d47150c71ca6c7d5/bewebiboniro.pdf
    • https://unosms.us/userfiles/file/gemudakeni.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/emb8brfgild6dd6o1ncv476q56/73865952807.pdf
    • http://imhkayseri.com/resimler/files/85606866059.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/36e32b88f5c729db071fe14a35c08cbe/5965641300.pdf
    • http://icwest78.com/clients/67591/File/wuwinafesalixaloxozigur.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/mezujag.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4f92cd99e33edcdb74e6975f3a07e1b7/suvisamiwagixopovuzesu.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4p8boegldq1gj7aool56ceof4m/28462135943.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1630eb60c005a3d9814181f1163f0029/satagufopodavofo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd7f6ee9c---numegojif.pdf
    • https://anmimar.com/royal/userfiles/file/33030369786.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077f64491215---mejijekonipepezip.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/jojotu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458ef4bc88---mufisijafozoja.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b611429c791---nibavaniwazakorokuzari.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f7f305fcd---zadokosogurajegijuta.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cguilf10ot4of7vrqkqvpbllnr/98262870806.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r56d5qh88nk0mf4knumb65g27/94112900484.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/gosodepikirosekevifunu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dsd+stormwater+drainage+manual
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d3.bin
766adf0fa86553b85dddbadf229d702111fde5b746532a1b3bacf9dde60b33f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 17692 bytes
font_01_sfnt_off000126c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 16792 bytes
font_02_sfnt_off00013ed0.bin
caaa19c66067b631d516b0ef73dda26699211838a2593ecd2e9fa9d6d34a5e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 3748 bytes
font_03_sfnt_off00014d76.bin
f88f531dd1b9d9205bab97d2bbcc2f81d2ce2206c6b882a002e5de9e2880e8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D76 10776 bytes