Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2611c647400a6d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 01:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f751451b9bfb6c2619f05a771e6de8e0 SHA-1: bc453707d3b8ebc4fbc8816101bb79c265374ffa SHA-256: aa2611c647400a6d8ae5c61245795e6ba92741ff4a8ad539920e96139cc0b3f0
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. It contains numerous external URIs and links to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=meaning+of+the+word+construed PDF link annotation
    • http://happysmilecard.com/uploads/files/lufaj.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/rujerodunak.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/90270057294.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5565d1c4---seponinesixadi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734305e6335---fevolovok.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/45300868859.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ee8acef0---30636311037.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/wominekala.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e76bfb1908d09e101af4a9ef6bb2f393/8679537630.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/16754029611.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/52585292481.pdfIn PDF document text
    • http://minhanh.com/files/94383762154.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8e79627cf---vaderoromazebipekulek.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085723c8cfb0---68321243855.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/kovaviwefote.pdfIn PDF document text
    • https://beaszemin.com/files/94202104863.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/remogibik.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc4dcfe7f---31436865925.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/53708199528.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/temulix.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942393dd428---fejizakasit.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7eb1df2d---16464004299.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/74982595273.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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 10888 bytes
SHA-256: d6a7f3a8155b45a813753a4612246f2a8dbc2fe1d9bfc39785b4375f89c24483
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16860 bytes
SHA-256: ee1cd3e905aa7ee6ddb6fa85fd67e205823b3e23ff565dce8580b8cc624e3243
font_02_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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