Malicious PDF — malware analysis report

Static analysis result for SHA-256 8848ff7a335d3338…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 00:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 921c37b18a9a2e3608737a20c698784f SHA-1: ce3e35b6b3f5f0c6fcf1700e8fc0d8e439b2cd8d SHA-256: 8848ff7a335d333880ea4febdd030243e592b6595fbee80430a705dc8d661e40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of leveraging compromised or disposable hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=medical+diagnosis+book+pdf PDF link annotation
    • https://aakritidigitals.com/userfiles/files/jabopizekemaxefalemiguli.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/nejejiz.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/36252395410.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050257247632.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nosipura.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/xufev.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2c15a0497580a91eccfac8990d9f7189/supesejep.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/21682669655.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f6c777a---80033303740.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/31931436828.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4e306570---dapofoxuxomazekomujor.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161382fac78a3c---furof.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xodunasoniri.pdfIn PDF document text
    • https://buzyhub.com/files/foxudopapal.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/temarimile.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/25870992100.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/18035308434.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/zejopimagawulugisudaz.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/85141931114.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/xurevad.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161403feebaa0f---24035203303.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/72554e0hje9uqdci24ti4ne8mv/74026975281.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/kuropuferozugedewojul.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911053051009.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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10820 bytes
SHA-256: 4678d6290b469a8f3646d80d0e6b40f7246797bee0eb5f5f708d5c9874c52195
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 17368 bytes
SHA-256: a494709479b0f981cb068f8dc41509d16515c9af1a547cea138b3bae7d68db77
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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