Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ee76355bf1fcd7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 22:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cfb498f2c6dece6ca8f831e24f03af5f SHA-1: 3516d304b11cf0019ada4007e7a7baf58877b7b4 SHA-256: 33ee76355bf1fcd7518a02b76fbc0e3ef94bf1e6cfb725e1125e67422bb5c9c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external resources. The embedded JavaScript is likely used to execute malicious actions, such as downloading further payloads or redirecting the user. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/udoaroe1sshl71mqsnrak2oo36/59326173484.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d06b4eeb1---69462635737.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/penujevo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7bon1qhlafhu7c4639it9cr6t7/2250811854.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wivurigilesadawot.pdfIn PDF document text
    • https://biocoils.com/img/file/61481283770.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79dc0a61f---98900017510.pdfIn PDF document text
    • http://uamarkets.com/images/file/42559339778.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/ponub.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/97283490045.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227bebfa06---durexisibadabedapus.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2iv73dc61m0kj5h4rudipjdvr0/57357645718.pdfIn PDF document text
    • http://plncse.hu/php_data/file/11672496068.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tuxozo.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a40dfb11447323552d21c5dde8a990ac/78208416715.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/nonone.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/14838747810.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jpoer90h1plmksahgvpim970j1/33793546072.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c3dbc4d1ab7a7c2937e9feee5468d640/5208575934.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e354afcd4---83087601240.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/17348437720.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/32749461134.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/kudegipudefop.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7e25d1949458af25b41d61b5b6f24fd3/somewonaxifoja.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/27726470091.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604075308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baby+crying+during+feedingPDF 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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16688 bytes
SHA-256: 045f37988feb5c19eae2c8e4d176a9cfa3cda5ecc05ef2f755cbd82ce5c309eb
font_01_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 10624 bytes
SHA-256: 87810896976f3369c681b574d91fac67e4404c493241860410e614e99c574fbc
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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