Malicious PDF — malware analysis report

Static analysis result for SHA-256 7573ebec4e4a89f1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 14:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00c473711f3b332816f7582845dc048a SHA-1: a906bc7cc97b78f4499a3294409930c37d8e7c41 SHA-256: 7573ebec4e4a89f1741e56f732cf8efa5b94eb6c316a93bd7c6ce39ecc5d6ba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=amish+tripathi+suheldev+pdf PDF link annotation
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/57783367038.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/693d1ad93cc1696bbd9cda4d0c47e2f8/penuxazibixamojorika.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/51664091914.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/lixasuruxira.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/6152086147.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/46145444200.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nogot.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/vemesibudejiligunajuren.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109011359595139.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/93488067741.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/26732466221.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/85650824861311d9dce149.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wajemolunekazajepamafa.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/gatigopekovawaj.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/36092581022.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/46430634737.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/31484063481.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436f249da1b---bazogofewavewipamum.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/37131153976.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/33036321663.pdfIn PDF document text
    • http://change4best.ru/upload/file/jusafekis.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/98761597815.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41c38505e---36839182915.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tugasur.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudonosizeki.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/38389081382.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/safasu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/24099844836.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 18084 bytes
SHA-256: 475457cc0164c25c2cf06e3475b41e983f32ad2783bc3e3da0e8b36b8f769234
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 10684 bytes
SHA-256: 467de469d6d1243208d0a79a78e9b9b0e03a3acad5888d0ee46d3783e44b7bc6

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