Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd2e83cdd9d755c…

MALICIOUS

PDF

99.6 KB Created: 2021-07-14 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09c767bfa6fa279ddce539fb94f5dd97 SHA-1: 9854f7a31a9ba509488183adf4e473e38034374e SHA-256: cfd2e83cdd9d755cd39f3a19518eb9d22b3fbd8210542c0ac2ebf3bf7e90a5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cructi.ru/uplcv?utm_term=bourne+shell+in+unix PDF link annotation
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/u1lcn7gksmnq5399a9k9tgb4s6/66353473834.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a787373480---zixitelizebodujapivinaf.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/31984834196.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/81146746747.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2541effb---fazakosusutimus.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/zowejazura.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rijaxudozigepewafedojujop.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sunuvufona.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609433986fa53---sorusame.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/te0lo8c3f1m13f452305gqd4cq/28671840698.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v9svulrmu2dcft2t65csaupvn4/81474049755.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097490748e17---27965550245.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bexixewezew.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078947a0f580---73372785652.pdfIn PDF document text
    • https://jetaime-shop.com/files/wazugilegetibuvus.pdfIn PDF document text
    • http://prosquash.by/data/62967105319.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414916fdd5---87846839843.pdfIn PDF document text
    • https://airbays.com/userfiles/file/46667209424.pdfIn PDF document text
    • http://whatdwellswithin.com/file/vewuzazol.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/fapakunerajenusosixudijet.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9e9f3dba---kazamadufunewifeso.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/83382057672.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/74198232671.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1e10a09c6dd08923d27a633dffbd5805/43156699357.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/bd0b64cf11b7cdca520fa9acf50a727e/zeterezebur.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_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 18436 bytes
SHA-256: c15ca055b85434c6cb9a2f1e94fa99c99d5123a91e6627034bdac35c486bd320
font_01_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 10200 bytes
SHA-256: b7288495ce780257aaa281a0f3ac144423e38efbb2398ecf0c7f2b675c9a367f
font_02_sfnt_off000167b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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