Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4abb59b20ab7d0e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 09:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac3e7edc433b577f9ff01057107237b9 SHA-1: 29ac3b073a56fd9cf179d4d1ac443f322fcf2eba SHA-256: e4abb59b20ab7d0edcc92a19cdb7da2199f48a2d37526a4f5a9c6a47ce067370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://screen.by/images/file/37961457809.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/33299721844.pdfIn PDF document text
    • https://5uempat.com/contents//files/fuxijasefafudukekulobi.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3af6110be786197ba3b4407fbfb8732f/salidefuwunudazokijeso.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba3ed3e56---95867779022.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/xonimub.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210802151255_933389135.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/23dio38eqfn42bdc5l50ames73/78347009961.pdfIn PDF document text
    • http://ekotronic.eu/files/file/zarimuponemipibawugi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/pomadadok.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/600478e38b07f3ade75b62549687fd8b/27645032764.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/nesasewudezufopisupev.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/6055008944.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/sitilibusomonopupo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9kbup4clcpnfgp1em7sh3bdcb2/turafujukawiruzin.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210811_212103.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/32250232748.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tafed.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/78468929505.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fba3b00a5---16113083425.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/misebotelotexalefudapi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9dm8pr8q5bqeqnfc4gghcb0e59/ziwibanalusomogikosibo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0351c62318a90be856fda3fe3e591b7e/bimefusigidafoxuj.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/xikot.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xivegixasa.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/27119487417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pushes+and+pulls+year+3+worksheetPDF 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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 16468 bytes
SHA-256: c81692b1d0a3ecd6f7401c78a4d661cae0e380d0262e8390ce08c2c870cb6beb
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10960 bytes
SHA-256: 7bd2e5f89d5139f6265ba76e14bf0db473e2b2188d36b6e206573cd0e3b566d2
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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