Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef8458039e6256c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 19:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44ab6a027d19288e1289a6b07c2825fa SHA-1: 8fcf7f9dc9bc349047730bdc1f4618ee00524d5c SHA-256: 9ef8458039e6256ca7fdfa8d61c7e41c0a67711967a8c11b752b38107d513033
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bargiel.com.pl/ckfinder/userfiles/files/pajebu.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-8/20210508010021604242.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/mosudiwufipax.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/98050904291.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pukosira.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce202d33b---23277773025.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849f0ab3d6d---12702013598.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/falizaposoluxofipazebidis.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f720702d---82219004878.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3e78797c2526ddcfa6831b9f6ec0276a/24853696483.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0597fad16e---10839591380.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c97d6d1293476d4a2da929c5f8abc39e/kodokaxinibukodizodimudis.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d176ce86---vadeg.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/gomamirozixoguzonixufi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/muwuxebozukebari.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f204404d3---bowapenorof.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/73845445495.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0b7dc5ed8627aaeb91b206ace979bd99/sazixi.pdfIn PDF document text
    • http://jar-ted.pl/file/kidudulusibafok.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160876a2b165fe---mubizazepag.pdfIn PDF document text
    • http://kalikraft.com/images/file/lovumoralovoxig.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2df09f33---95228992391.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/25531199206.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/03a646e72ac730d8cee724b2b007eaa1/47393804743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=resistance+in+parallel+and+series+circuits+worksheetPDF 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10932 bytes
SHA-256: a7a51e892803d99fe007f36c5f7fbd125e95a5a4aaef5aaeb0dc0c6705cc6a64
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17564 bytes
SHA-256: 5776ce7ffb6bf284473d8acbf16b3db145ec9dce269a18b3578a3d5698a33917

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