Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0f147bf4d6819c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 23:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26df65c15b2f042dc1a8a1378308fa12 SHA-1: 2bf082a73c7ca5577398a2d0aee5fc062249f94e SHA-256: 9a0f147bf4d6819c331f7c4dbd81dca5552b6d18dead3723e04cea22047813f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=how+to+show+saved+wifi+password+android PDF link annotation
    • http://exima.kr/userData/board/file/14462972388.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5941_20210919221616.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/77240005030.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/zanolikefumekivewufowa.pdfIn PDF document text
    • http://signauction.net/userfiles/file/larozel.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/65814330023.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/riwajo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478b99506f4---modumedawelavu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/kutexozaku.pdfIn PDF document text
    • http://01host.ru/userfiles/files/41405348912.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/fifomumejupujizute.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/j6lkucqvkbhso8i6abq7av60i8/gomopaw.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109072350458515.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nixenafufijufifinamipez.pdfIn PDF document text
    • http://naviway.su/upload/files/bosopufemexek.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/87265749920.pdfIn PDF document text
    • https://tomas-music.com/contents/files/80283050882.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/tajoxexozaxakomarobiwozox.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161373ee7a81ee---kataxemibaw.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/gudilej.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/gumilirewesivuriso.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/78547601867.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/71545746697.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109100402007421.pdfIn PDF document text
    • https://tenfci.net/userfiles/file/metekozadiduraxiwazat.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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 10692 bytes
SHA-256: c3b10e3cd87c1705a6fa5bfa5388e55edb1b645c2db45aa9b9ad410aedf3d0f7
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17776 bytes
SHA-256: 520a7d8250961f8be213fa08649fbb32ad16b8922b695298abcc7e6dc02dc57d

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