Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b1570319199b68…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b91ad965333023b2c48a566f9f28c8d7 SHA-1: c017e370d5eb2882653ea871b9f9c6ebf13a425b SHA-256: 72b1570319199b68cacdf11aaa3038838c676e54c1af4468c5854a736ccd9766
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zzwgjx.com/d/files/lujomokepelidomijekix.pdf In PDF document text
    • http://rem-proekt.com/f/file/miviroxebupil.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/vigowosowaguduluwisetuvuk.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/12727143883.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/pusugoval.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/zigiwuwuvujofon.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/kaxawolofukeri.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r10656c6rcuphr86ktf9dr4tg3/wavonexi.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/50738433184.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/fuzubatovuwozudalurosar.pdfIn PDF document text
    • https://onlinendttraining.com/files/29181182684.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/venuzafukepudeponiniki.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66281515378.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ssu0jb6jchuh3eskecadgmgpev/pudujufiwiponanasalizasan.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/tigurepovunuxowap.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/81001381852.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/3694168924.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/42381626766.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910061048_b0fyf0.pdfIn PDF document text
    • http://net-work.cz/data/file/begowosurejematulan.pdfIn PDF document text
    • https://theipbuzz.com/images/file/42708166453.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/32800960557.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec054ef677---43906466755.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/bonomekunokokazomu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3fc31f0aa2b7929d4df63c21d9a9ae11/pikovalijivigoboliri.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/rorejikogapudaloxebevefos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mr+android+customizerPDF 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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10640 bytes
SHA-256: 705b425b01cc07f63db0294d1347229e69e1d7caf2c4214afbf16143851e7984
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 18456 bytes
SHA-256: f05372805c452510c4642ca374188188456e4c83b55324660b5bd33a9de33f88
font_02_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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