Malicious PDF — malware analysis report

Static analysis result for SHA-256 057dd8e7903526f5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 09:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee4f1c2c7869fda20b24f61fbd0c2aad SHA-1: 279943cb0bf11c294b235b6acb1caa5ff27ee7ef SHA-256: 057dd8e7903526f53b11f1d4ac770178caec43739a3df7aad83a9d5fe11b2980
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. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution vector.

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 http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/odq7sf0csfdejuf7ves3o0lve5/47770079882.pdf In PDF document text
    • http://simonide.org/userfiles/file/76813208172.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kazateve.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0d9ea31f---97182214047.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/18658039273.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210704195756.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/vedipowubumubonekesivata.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/62746856404.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adeffe30947---25696889287.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/80604989262.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/df2906411712f2f93554837b2c2df619/sabazasidik.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/af548db6c6a77096d569ea77df7e766f/kogevibileju.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4645d9b39b---33542569966.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/221954469740.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070c320c617b---79274406149.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tebafuneluvaribefepud.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af0fa19e8b---26469901960.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be78a80287b---ramugijadit.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878db8677c---vatulirefufamamis.pdfIn PDF document text
    • http://usagimatur.com/files/others/16031175126.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jn12m2chhbjtnguoi8hu23vkv1/91035439653.pdfIn PDF document text
    • https://papiratisk.cz/soubory/1698031721.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/45526350446.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/31512190815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=solution+of+a+linear+inequality+in+two+variablesPDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 17172 bytes
SHA-256: 1fd8701cbdb43df371b560f4d8641ed918823324485635c93318f84b0edc1804
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10932 bytes
SHA-256: 92de2260d13a3cdec67bc8a26c2cd764f650ec5e1f7bba1ce64d5d7ed1c701c8
font_02_sfnt_off000134dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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