Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882f7f68eb64cd3…

MALICIOUS

PDF

76.4 KB Created: 2021-10-01 02:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19dd17c447f79a913072bc92fae67483 SHA-1: 53d344db6967ef7fbc55cea7e51117f6ee994f44 SHA-256: a882f7f68eb64cd363bdd9f9e4746cb0a63357e401334e83fad51f4b44e57016
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. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161560c486bcbf---zesosojafum.pdf In PDF document text
    • http://loveperfectionschool.com/upload/file/78331965854.pdfIn PDF document text
    • https://morabia.fi/images/file/56839171650.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/71158042507.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/bafopasafakibu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/70712716315.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161560d341ad22---tefuwib.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/35053810529.pdfIn PDF document text
    • http://skene.es/userfiles/file/79300416077.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/83425815336.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/31379144472.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bphh2elrask54cdt3n9auqie82/232584245.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/vijisedatamakuto.pdfIn PDF document text
    • http://foxadv.net/file/72472931543.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/terevap.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/12425349166.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/09da03b597384a4d1783c5ebe0b1f210/jamobewakujozenuduxorava.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dafukajotan.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147381e992e4---24850808888.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/puwoterilifoki.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/pixobudafanoradi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/76292229411.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/16427737230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=king+of+glory+download+androidPDF 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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 19992 bytes
SHA-256: 9511e357df1ea240e2593e8c930c4f9a6936b500e0d0d27426ec4f04134f99d7
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10324 bytes
SHA-256: 1dbe31ef69dc3afbcecee4b08a04795df7623a7f370470a54934192363d1c9c4