Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5d3fe6c2d93e91…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 12:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 101d3e45bf6f9b2e9331e8c44f511959 SHA-1: 92da81f6a42c0eb1e21aefdd93e0e4737d69f8a5 SHA-256: bb5d3fe6c2d93e91088ee96fba7b804bca1f4eb8c70fb65861f29b05e4186feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the nature of the heuristics strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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://laborke.ru/uplcv?utm_term=pending+tamil+meaning PDF link annotation
    • http://asbu.net/uploads/FCK_files/file/70628934092.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/dukugok.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085794178ad9---katuka.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/latojejopuvemurokefug.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/66117166021.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953629f44---65971595769.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ad03ql841b3j7ph8agmphea4s1/73010094721.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdcec1e1f---matibatonoseteg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad8036998---76086943088.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/konelenumawagamodovid.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ceeacb18a256aba818fcbb193b6a99b5/juromuxupavawametiz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4d6db8c0---tuzisobogunajenu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdb24e952---dapilifirabazofujojupo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bb4e283c---xipopud.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/69194479209.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/zifomowefuk.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/46399256966.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kofonubaberufitaliwuxi.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/61850288326.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/du646aavbqvha1koj1pd86qkqo/wuxakorifazun.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5f15948826b73ae2438bcaf77356593/jamiwaf.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zakupimi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a05e442da---xowexenisagovizelu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2845bce1af1ba6b0f711a04c7c694cd5/tikixesebipovul.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6chm7bgl4cfg00deamhio38346/watagadafuxatufufij.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cd6a9752---xepeduziwore.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607775784670e---80791345516.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001428a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1428A 18864 bytes
SHA-256: db353a89d5d4101ce012fd5813afa50108217c0d3bd067107d611e37dedeb7c3
font_00_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10204 bytes
SHA-256: f81614b014a0ea4449f04b275690bb7e5dbe03f120013fffdcf1483a43d387d8
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 24236 bytes
SHA-256: a80cc3110e85f3e73e6c956cd4a656a8f26e87a2d61bde0941b9399e1c3b6de5
font_04_sfnt_off00016180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16180 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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