Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b708247e2950f2a…

MALICIOUS

PDF

76.1 KB Created: 2021-08-07 12:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb7b5c751e211b5d78ce5d23c7fc79b SHA-1: 28c5f85b21d733f74a9babe913be5e1a02cfd043 SHA-256: 6b708247e2950f2ac775c40b746a6ec89d4bcfbec70558bd9ab3556dff61ca8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised web infrastructure. These URLs are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=how+do+you+reset+xfinity+router+password
    • https://petikdaun.com/contents//files/36253709954.pdf
    • http://jp-cable.com/d/files/kolawonakaleza.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/v17n08ktdj996vb60g5pg5unu2/23922425252.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2d56196677ca917f9181ac5134f5e363/31677017591.pdf
    • http://thepokeluau.com/uploads/files/85339604995.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096693dc287d---78440571827.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc19635b3---86596604762.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c597a39bc---15353955971.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fab391d2ba917d850f35fb6979919791/56477467674.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e2e155a05f7622f4a5c9d1f1ac6c41b4/rivifitulezupig.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ce2726721bb353645c8fb3e92733711e/gabevagedamitojev.pdf
    • http://sklepjola.pl/userfiles/file/nevifij.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c396bbe46c11a9beefba86ef54478356/robowejelisosobezeke.pdf
    • http://jucal.es/images/file/bumefugobufob.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/555fecc52a39ced3f38c921c572ac109/4897134159.pdf
    • https://gencshow.com/upload/ckfinder/files/zifivumelojogenesabiwe.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ece1c7a9d81---vatowupevubixe.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080c214aea83---dekowebuxopev.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f3d5a2938---jagakigosek.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/3598391523.pdf
    • http://cncforginghammer.com/d/files/82006373566.pdf
    • http://coimbrasoftware.hu/images/uploads/files/xekosaxa.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0fde4934---womebopipefelo.pdf
    • http://artecgroupservices.com/imagenes/file/xujelume.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/nufelulatowetibixa.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c879.bin
07052a09bb170473c082e5efbf05f0b93e29f6d17bb1dc5757e9ae10448defa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 15956 bytes
font_01_sfnt_off0000f17c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
font_02_sfnt_off00010993.bin
1b64867c6dd490180496aa2c6982b47a643644c82ed0933602d9920a7ceb7e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10840 bytes