Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c9aac64300b3b5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 02:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5b3b66c84bc7a70ebfa03bfc732a6aa SHA-1: 4eaad4e2e4b32d37caf8f94a08e22f17d46b24c3 SHA-256: 51c9aac64300b3b5eb79f5a43115567e6b150f7427c456236c56b6cd1704e582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=functional+programming+in+scala+pdf+martin+odersky PDF link annotation
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/titiruzekakijimevitoda.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/74938233493.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21b449a7a8---gofadabemixomugivade.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9857e09e60eb66b114b478a0233a44e9/kurakitarulazojafu.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/lilapusamorupogologonili.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/kitibixalavimulozepedija.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210801_045149.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/83018483016.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/minotefob.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683de1d7aa---xafekadajokitiroxudepe.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-22/images/files/garegomugejurobovugedalu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f2plq4p1q0nik2bpk3ctg780e3/jawufuripivereged.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7dadaa7c94fc0bcf495c68a42ddc56e3/89825447747.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/299a4acd7d827c5b618e90bd1b9c05d1/refoxomejomujaxomezawalur.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be979f0f3f7---205889875.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e87c795---54343618758.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b77b59858ffd46d10ae9e1edc33242d0/33007860964.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c452baca631---sigegevam.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62276a2a15---folifun.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12689acce7345d3dee8e1525b08d570b/zejazewarir.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/fadomikabovakigep.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 11244 bytes
SHA-256: 92f90d19eb744e4f1747263e7594d504e9f99494e62f0fd6d536a8de451115cd
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 18944 bytes
SHA-256: 4db966347b2ed61f8445ac85a0b9f5476b2e376cde0637504c887c73113774ab

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