Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a68a760f27ff1f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 09:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f813daf8beb88a324501a107fbb7fb7 SHA-1: c56c84be9ac901fe8749f7be2a69203826e1bbdb SHA-256: e1a68a760f27ff1f8886746d05bc523ea436bacdcb5468b5ef5d72aea9f6b84b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or visit malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://madurastones.com/userfiles/file/fenat.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783e395997---jotokavetawozemaxiji.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/zifivex.pdfIn PDF document text
    • https://matrixx.lu/images/nokemivaxosatafeka.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xitotokep.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16147b71082505---pupilasinere.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/lebevezosarazuja.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/25071398665.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/70586999726.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/63330768832.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/bifiv.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/4847734531.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/tibikedowitivuzunobidor.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/57451526939.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78282250053.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/55905370667.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/76273762086.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/doketopopitizag.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/12445681937.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/mogebolojar.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/darifuxelagexu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161463ea30c467---ruzitofikafekasov.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/61179988899.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/kigejirakano.pdfIn PDF document text
    • http://proxima-online.it/public/file/didaxanejas.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wofolonimezaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=seuss+isms+pdfPDF 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_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 17108 bytes
SHA-256: c98ccf6639fc7d21bbf80d0f50a748694b919fd1d0a8ddf0182e6befd5809839
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 10204 bytes
SHA-256: 0e3849dfa25f38a2843774890bd28e1ee26e5a8838d8077335d5c5678da12f15
font_02_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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