Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb341b9300dd96d…

MALICIOUS

PDF

100.3 KB Created: 2021-09-04 23:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 634412122ba2228f9cfe5e3861d353ca SHA-1: 47685125e8bffdcb29af0ca8220df028068c43fe SHA-256: 6cb341b9300dd96dacae9eaedc7a5362dea6a74960bb1751acc1cca92f8ded8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://smidgel.ru/uplcv?utm_term=fossil+evidence+of+evolution+pdf PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160902bba016eb---67114695057.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/75892859273.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zasaxakiverelapujavusefiz.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/33302899098.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/92938988451.pdfIn PDF document text
    • http://grandfiltr.com/files/file/zuxutojisagimaxorelukefix.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/81742634620.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/wuzebawegijaxerewefetob.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c55603264c5---8914776291.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/at944ljl9mjt90s1kvir9f22m9/32227328657.pdfIn PDF document text
    • http://soupworld.de/upload/file/tololaxanulinesoz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc2e9ef2a08c8c3d7cb4079a073bc76/53588931071.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/puwumitoxonadaniwofizenin.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceace99d75---riguro.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9112ff0151---56046579731.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/69251513262.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pruo2bp0k6ef2b6j6la5u2q5e6/81291706445.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/jarukujexigibugax.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/baxeribasupi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/75927802528.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/92896847765.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lrh730qqhkl35r4qurv891p44b/7595525939.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sinadevelufezifedixefu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080507044673499.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e1a3ee8d---vomujelaledovemodawipub.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/86681118236.pdfIn PDF document text
    • 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_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10496 bytes
SHA-256: 9f8ea3f7aa5c1f178511741171912a294c0aa4f1e6199a95215c0b824783f7ba
font_01_sfnt_off00013bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FE 18316 bytes
SHA-256: c056f798a9cc5e4d279acf8977967bc04f551a349a2d24a6a570eaea56772b12

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