Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce417ca0836cb7bc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 11:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23c9dcd94ac8ffd4023b482c902d416c SHA-1: 0a91059a67d654c11d533ace03d8bdcd9278e911 SHA-256: ce417ca0836cb7bcc89b92fa0296adda138c87f335ee08e5f91c66e5d8b614f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=metodo+global+para+ense%C3%B1ar+a+leer+pdf PDF link annotation
    • https://willmarareachamber.com/ckfinder/userfiles/files/54918316207.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/30662098771.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/26551087724.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/donedo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rcn0dcf4809lkt0r9fd4ve3c4v/ranupenurawufowevew.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/subefisuvubixisuwafu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/10b9547c897c4c4851b2aab914be1993/rerajavazorabojotufepire.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc360622830---51260553488.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///78802129359.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb86a47cf---nizodumikapa.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210621073526.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kamv3ehrmsh2kvfum1a68auvp1/29685740190.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db2c0b19e---sipigud.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lcva7cpddo47omprhpbfnsjc84/zidulopidiwetezurikusete.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/67563814424.pdfIn PDF document text
    • https://aashianarealty.com/file/solerujuxefipulofip.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ks7533lberbh7lflld6fshbknl/xelikilabiwuforiredoz.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/banaguxodulajubozezi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/45239621372.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/49284235572.pdfIn PDF document text
    • 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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 10920 bytes
SHA-256: a08b28466ad7af183c6d319ebccb9f212bceafa4ec593ef46256d697f5852bd3
font_01_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 18732 bytes
SHA-256: 17647e8605bb9dceeee9e7af6f0940a2d85bd07bc3fccfc757d108348b4c47ca

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