Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8071cbd53df0934…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 12:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42e3eb1bae21708e59f6d96d043cfab6 SHA-1: 24c52e2ab163538fbd06e5f6d8dfbcac96b03428 SHA-256: e8071cbd53df09340b02a716f23763efdf09c910e57660030187dd39d9e476a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://krisoc.ru/uplcv?utm_term=download+best+graphics+games+for+android PDF link annotation
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/54902122245.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/kimilidezeg.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/16978957693.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/54430066505.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/70322171104.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rapenekabupivinilaziziwir.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149cc6ff3eee---nalevagefojanamuse.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/40970040122.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/donepamepawamodalojofese.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/ragat.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/62614143973.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/39175687875.pdfIn PDF document text
    • http://bdn10.cz/files/file/29818030997.pdfIn PDF document text
    • https://digireg.sk/upload/zigaratupi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6393dfac---lopuwidalatubesolakoja.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/tezojoxilabajipir.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/xexuxigelijuwanuwamapa.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/mipumetiketebosuvaj.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/1034004485.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/koliz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27e5378efd586ac165926fe7aa09f04/xetexopilupuzi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/25253474861.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/77006159153.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/25/file/55583650844.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adc225cedd---rolasimefiwesun.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_off0000afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 11292 bytes
SHA-256: 6b7dabb85baed904517c5802a6d36305f701831e2cefdca4fea7bc06686a2d84
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 14688 bytes
SHA-256: 299c78cd6ca256335fe19ce75a752c2d35efcee16effff148e916c1df59eccf5

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