Malicious PDF — malware analysis report

Static analysis result for SHA-256 7469c08ca0c09c71…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 15:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afd441030bdf401cf5ba5979eb074f65 SHA-1: 0ddcd8eb2b4569014d4e9986b6c00661cfec71c3 SHA-256: 7469c08ca0c09c7134a50383b9033413868a97ade7afdfbaddc7a55ce58c2936
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a Pdf.Phishing.Trojan. Embedded JavaScript streams and a link farm pointing to multiple WordPress upload directories suggest the PDF is designed to redirect users to malicious content. The presence of numerous unknown URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9e306a11---lavujubafomew.pdf In PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c10bdfac2---12135557486.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/watedapokujiwopukoj.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/birubutuwokesoteborotufo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/11243049878.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/90531660315.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fbca13ba---metogaguvubupixinivivox.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/18282545438.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/zukevafujevuburapojuja.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/fekujasegeromumovu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/62912397767.pdfIn PDF document text
    • http://sns.hu/_user/file/zemuwafebedobaniposen.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078bba729567---4114591026.pdfIn PDF document text
    • http://iphysiology.ru/upload/12614429380.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nj5o5t328limbs4amklmhj7e21/56376374997.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/05e8eebbd5a9a05bec1c053f17c78472/famowebodunageweze.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a147620e---lesogelujogibelopagakut.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/jewev.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/sevetawubowokabidexete.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/13319439044.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/63621304629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hand+off+communication+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_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10964 bytes
SHA-256: 6969d432e86481d339380e147815a77c60fb22944e701b2314ba0ef8800c60b8
font_02_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 18028 bytes
SHA-256: 1e20e640e20a7db0e4bad714cad18b66894bd6146790e1528f98073830ad010f

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