Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7010cb641c48e4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 12:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2884cd22e937cec5887f323b4b82996f SHA-1: 0e0f8c743e1854445efe087307ece815b2ad8f60 SHA-256: 7e7010cb641c48e4b64453f5b4d46d0773a411a271db675c5d19dea3df1cdb7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

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 http://rollfactorytogo.com/uploads/files/tapukiwekixozakemazejuk.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320086b2706---sumitivataxutininavaxadib.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/20980537780.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/88232475723.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nujofugapunujobo.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/28640133341.pdfIn PDF document text
    • http://adriennemason.com/assets/files/difutaduxifulubirijivigaj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350e2ea3410---36942954071.pdfIn PDF document text
    • https://posh.hr/files/51988060926.pdfIn PDF document text
    • http://fpole.ru/sadm_files/kexanodabusizo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613979bd48d90---34458619836.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/94679789959.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88593203770.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/9410476462.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/98308218644.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/mavixipi.pdfIn PDF document text
    • http://domosplast.hu/files/file/gapakigitapa.pdfIn PDF document text
    • http://fourfoods.com/images/files/21464949347.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/lawutezujaw.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/27352101272.pdfIn PDF document text
    • http://reopen911.info/media/file/53245923334.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/75881202975.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/daremepipenijolufila.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/dobodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+unlimited+minecoins+modPDF 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 19028 bytes
SHA-256: c24de4c5059d6873b2a522acc6cea7079bdb083e23abe6116146fa84d7a3d146
font_01_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10728 bytes
SHA-256: 0d157c39014332886162a70ebed2ff17ec5fcc47bb04a25639c1a3f49897fecb

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