Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e10ae7553154e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 01:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ea9947a2658927db20fb4f7f05b11e9 SHA-1: 15669dff6ba83d49e978eab7d86bda4b271b30b9 SHA-256: 891e10ae7553154eba14a48ab7e16d63fbd1774701b74fcc685547075ec30194
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. The sample likely serves as a lure to direct users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=introduction+to+thermodynamics+of+irreversible+processes PDF link annotation
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/k0e9gdfq74h8a8dv9sollu12ci/sokugale.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8145fdb1e943362a68085b0bc38aaaeb/74556378612.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/32204188787.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4b43c0cbef5a9cfce52421a1512e62a8/16684740773.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/neregazavir.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210722125037.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607564a8ad781---57757413924.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1vinqj69kf7h0r1bhhe5qejj0f/tebuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bs4d5rhl0f65c1gue91pdnsqu5/mubifewopon.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8995cd72a1c8ced65b47fb6a5662951e/37618032117.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/19757229473.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zizit.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/62071585142.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c788f06fbb070009b33faa5edf972975/85432686198.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/jiginuj.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfe38f31f---55073510693.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/dcd002a876a96628e27fc3b6fdd8f891/63108227014.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/kupujeg.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xidoworujeludonodu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xoguvudameludekesuri.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7c304f48---xuraxegowesugisijabop.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/91889743815.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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 19884 bytes
SHA-256: 3e8fed2fece7402de05717b5f37f7a2c6a2be6156799520cad6b7919cb7e31d5
font_01_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 11256 bytes
SHA-256: 1d1f493be288aa2113713b8115f30adc0bb1021132468c88f50e70a44be76580

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