Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a22da3d0cea95c2…

MALICIOUS

PDF

88.0 KB Created: 2021-07-12 17:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a421cb25612a2bf330c280cbf6ab4dd2 SHA-1: 905c5af3382a806dc0708e1a1489e6bee9a1d041 SHA-256: 4a22da3d0cea95c2e6343e8bef7e4d086590191e56299db5f996d9f97a5e575a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e6f9f35da9d5f5a04c3ecc4a519869a0/nizag.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rapomepirovuwalofamali.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/90135193228.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac4e67f81---41744219370.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/pokosinivoxi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb92d09e1---jabix.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/s21f62v5002br2dse44qjutcec/8767836389.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/68552201726.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cj0emttqueo667od2lthahhfaq/75025577733.pdfIn PDF document text
    • http://consade.com/userfiles/file/repabesite.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4f6d403e---rorofoguwag.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/liretidafewilijinujujijof.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4cd10bf62b4d8943577147b05e9f3258/biwewufevajese.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ca712761d1c1387ef78707e2743c1929/63854509815.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hv4cle3tipb4vcig0394gu2t9r/56957630278.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/magekodizegujuzebu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/69204328442.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zesozibur.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/92545151957.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/72535489269.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/gitavuseposusa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727f1638c4---rewanuzetakinerigexu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6a6b7f5a---jetuzifupu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/40627331188.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kidilemimi.pdfIn PDF document text
    • http://gabortech.com/admin/file/60966145198.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c0576431---91316508629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=monday+night+tuesday+night+songPDF link annotation
    • 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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 18028 bytes
SHA-256: 54b8b6b22d2e6c4823699df3e8c6209b2d708f431d28e55aa7778c08e9857c01
font_01_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 10588 bytes
SHA-256: 028559e8bb8ae57458ba2c0abfbf10c21e13c7fcb3c88592072d941f8a90c682

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