Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf3e12c3f0c4336…

MALICIOUS

PDF

83.2 KB Created: 2021-08-13 00:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fda94653f5a231f5ab6e1b8dd141acb SHA-1: a37a074b3dd4ec748ab743a015dba02462ec11ae SHA-256: 7bf3e12c3f0c43369ecff905cfe80190dc87318f1f8a747acb64d6ffb212c748
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery intent. No scripts were extracted from this sample, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=circle+the+word+that+comes+first+in+alphabetical+order PDF link annotation
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c7a4121d43096d1d55db3a956fa02475/10059640396.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/97af9b49590a578e6ea5596dc58ecb6a/puvajotukoxusados.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/1925625563.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/51931271348.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d2af9c088---5265310958.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/wilifimototugiwu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/81572a473c3caabc100dfa210d25f46c/sabutaneveneli.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ct5p66k46e3gq1ufmlb6dpjkfp/81879780250.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8c4c2e1d78ad7828e80069a451deca2b/panesatababusepiberewe.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/tewenamabe.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210709_012251.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/87001962622.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5c8b866469883c07b379e993e110f9d6/guxutodunelutol.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/515c420bbaa8e8d41d1ecf347dd15c53/31030568364.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713042242.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.pdfIn PDF document text
    • http://epsilonsigorta.com/files/nisap.pdfIn PDF document text
    • http://skia22.ru/pic/file/ziwuluzatud.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/bosajelarekejuva.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/sepix.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/zetuv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54c363fba2---33601840116.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lubabejixuxid.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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 11144 bytes
SHA-256: a4b28bb479cb98f3bf22c6dd6240c81ffde929dfd5c36b4ea9de422fe0054f05
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16980 bytes
SHA-256: 8ee24aa8a7d5b5c2fce4c2bd4160e994d2531210d3a00f1980b41e8028f87db1
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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