Malicious PDF — malware analysis report

Static analysis result for SHA-256 f160b9d7854a361b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-04 06:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe8a9a01451445d080a52faa250e0bb1 SHA-1: 948838a5cd6e45c64cecfc007e0980c498888f46 SHA-256: f160b9d7854a361bf1a0c1606813116fa9a69773fdb49f6fa48616a2cd5f9bb3
126 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, indicating it likely serves as a phishing or malware distribution vector. Multiple heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to external malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4339

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=ecuaciones+diferenciales+lineales+no+homogeneas+de+primer+orden PDF link annotation
    • http://pkynfe.net/userfiles/file/jexikikigused.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/69157969666.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/05/68059763626.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281d02d36c---nolotojovodawi.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/5507567042.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608677950fc07---kujabuwivodaw.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060500220381.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/25691323657.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/neruji.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/nojubu.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/xujorogituwifosew.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ksh7n4no1fnqb3q3t8jv1foajv/99600551621.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce056e0ec7---67054256889.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/vewoxojobuzidolir.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607649b653fa5---94994307323.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e3f519fed7f93ead18dac07dd9bd430b/22337379974.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96d7cfa905a6ece89559d4a137d94039/jesoxima.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/82095612913.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/vugawotikorodolimulugi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0edf92fb16029b38a5d4335857b4a48e/zesaxakulinexikuworiruxe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2lh9t6jfjqf63sksjc0vo5hrkj/80029463137.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/986fec11cd2aae6bb8ff709cc3b23d87/85008641847.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc4bfa2ffd---19420282930.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/dc9d69243c2a3a0187cd7596b8ec9316/22952815240.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e521150be584a57efa257fe34306dbf9/58202635829.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73e78dcf---najigavapibiragenifupa.pdfIn 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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 18836 bytes
SHA-256: 3092fda22b710d8173188a16270d7ac54054cf343e49780dbbe86ba8542b1ac7
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 11052 bytes
SHA-256: 18d71a85ddbfd815f93be9af8db1f98e8cc369ff110a8dba18981f9a70360fbe
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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