Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef4d4c8d38b3390…

MALICIOUS

PDF

91.3 KB Created: 2021-07-09 04:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 399aab525211d16748e3da3f2af6c526 SHA-1: ed4d2014b196a0107d85e5e97190af8fec51dc29 SHA-256: cef4d4c8d38b3390fafed5605c331f593d8690feed6221cd5a2a290bead668db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on various domains, likely for phishing or to serve further malicious content. The presence of numerous external URIs and compromised CMS upload links strongly suggests an attempt to exploit user trust or vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://smidgel.ru/uplcv?utm_term=small+wrasse+species PDF link annotation
    • https://weddingitaly.jp/images/file/88533104267.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e6vmk94tl53hbi0muo3lo1ssee/bujitofuzesofunutijopopa.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d235c4b4e2e---ruragadagidem.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b811ee5b408---gipakotamivozilek.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3dd0b4d6336ca2b53920fb385e459aa1/59883036597.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ecf0f96---regawawusezi.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/96877233834.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/40630714873.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nejunigapilakorowigo.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/22223267670.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f187f924c2---bapewigugusabododufije.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4aece028b5a85b685aee6907f6e8f8f9/zamunelitizepudowofoxa.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/zidolomisof.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3bf1fb919bec94325fc280991c78d583/91861108457.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a201cb1bbc7ee55aa9f032f6e331db65/14111958039.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/newoxezoda.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/aa08efc34be25532e0cf65b8c492bfb0/fikunejupavovenofiwegeso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315187dfb2---wixomegaxexaxinat.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/mupijupekuzexewekexo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/68202842265.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc924d80c18---68375769081.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/rolat.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bcea907f0---gogojezugadof.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084c10f43bb3---powenep.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6318e89e58c8ef0305ceef22b2d4d5df/46793464032.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_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10372 bytes
SHA-256: 6217a51d8712b716bd69fd3ee2d64f5e1596b5d26e4b3a712c11f5891eb18590
font_01_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16700 bytes
SHA-256: 6f603f56c17b678a30b90a63269f8afc77dfd639c754cf0e505b5667092cf117
font_02_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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