Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9768ac3f6b035…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 07:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e56477bd6b1d33f189f33d9734e6ed3 SHA-1: 2ea1a10968922c739294fad33d33bb91a3a29b84 SHA-256: dbb9768ac3f6b03536c25fb10f72e748cab7019c563068ba835e71f5d71e7151
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 domains, several of which are hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dianacb.cz/userfiles/file/daretodemuw.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/vezuxida.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df0213599---30782876362.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8ea31e7d---bosugorovufabijewepebi.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/74206771428.pdfIn PDF document text
    • http://aimic.com/userfiles/file/negevapixozinipeja.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/fukuxaxotimet.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vp42t0g4j27pmgdldggi846a3h/lamusevagusaviso.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609250dfdec50---deboredotupexenomu.pdfIn PDF document text
    • http://ridendo.cz/files/file/86959860474.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jesobepekubatipavorawubu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d09ml5938b3fmgadnrr55dsu2g/vonijemurevabumajaj.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9q6u5d0tbt38k7jl0prjtqf3po/lotajazezitofiviwiz.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/sarerevumaropif.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/78350843059.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/rimawajanuvipepubijit.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/76399097265.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zolofemikeliwasisen.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/tovidewawepav.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a8e87360247073f71178e1e24ad02435/70322094665.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2b645ed1ffa48ddf2371dcc1009d3f41/53121985011.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/rigubimomejegezidasepikag.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210620144500_mdhbzk.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/d6bn9dit5cdrt23nugqkub6081/18935267433.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98708523500.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/dowisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meta+analysis+psychology+pdfPDF 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 17128 bytes
SHA-256: 08cbef0095f724faf3f33d948672b40c97fbcd18f24700cbe52b36379a35062b
font_02_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 10908 bytes
SHA-256: d3fd3050ab51b82f24d0dc0c898750194aeebb5be9c5da835b94755887aabca5

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