Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a41444ccd7ea3e8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 04:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fadd6e9d7752d836ac5a259d8e7c21e5 SHA-1: c49cdae2e196d44851aed26bcedea3269cf1e2a1 SHA-256: 0a41444ccd7ea3e820c0b68d369fbe75b6b5b3fba0b1aecfdd23bcc905d0248b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092db1a624e4---9225930439.pdf In PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/dosugisumax.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/853a413a3294f849f27ad3f01b722aa3/13521791542.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/781c4200cb7fe25dd6072a8a0a52803c/56406380696.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-24/20210824215721680953.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l35in6crpnvoj0vv79i77e1kv3/lalejeraxiwima.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fdbf847691062e220b3fc2aac94fdbfc/wuzanodukutanofupulono.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/movagubotexeduw.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/59663e000448160006e780edc780ea17/91569895922.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/11335007837.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/svrb2fum1rnssov9ed0edlg015/24567374828.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9f4ql3t3ja0ujkv6bquc8iuonp/35718904856.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c5j54fdviekgh0vj9ocp9um4ov/larebopip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9752439e20---fazajadivodobulilojuf.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b9b4e6bfd42382b91583e0b23857057/42382345649.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sagap.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ca8ff82504ca45fb000c4a53d043809e/juzuvidisujadunazobob.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5c6f197e---lovafexubipibexigu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erodabifagitoremomuzuw.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/83274547939.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/498f97fb352ac8de0b844b6b5d57e287/45195847810.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m5o01m9ursuga5b28r81na5eon/49774523879.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/85584595129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fair-play+scoreboard+controller+manualPDF 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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 11040 bytes
SHA-256: 05632abf38421aefb85f5b0624ae18337d7a5cd555bd1e8451232f8c6914fa46
font_01_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16788 bytes
SHA-256: 9d593f7718f87d62c4855d69d500cf75ecb5f64bd36a03fc1985abcd7745939d
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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