Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8e5ac5d759d560…

MALICIOUS

PDF

71.8 KB Created: 2021-09-09 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c896472557a281c2b2c6a390e6cb8792 SHA-1: feff4e8c6b34823211a9f6aeca8dc31146446be1 SHA-256: db8e5ac5d759d5603fa3278abe3eca51370857858fda8d21afced3a58e09f32a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various disposable domains and compromised CMS upload locations. These links are likely intended to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=black+crescent+moon+copy+and+paste
    • http://seoulsquare.com/userfiles/file/lomavesul.pdf
    • http://haithuanphat.com/uploads/files/83726041715.pdf
    • http://nacyc.jp/Upload/file/71687716682.pdf
    • http://autoachtercamper.nl/userfiles/file/14694139311.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352eedebe49---wemebubugusune.pdf
    • http://aurora-c.jp/files/files/19759974660.pdf
    • http://pronobile.com/catalog/file/gefulinekob.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/63929648655.pdf
    • http://biogenetec.tw/image/files/20210904_231952.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5d40e2724088fb6a4e166aa341bc0c19/mevawugosufibizet.pdf
    • http://shippingengineering.com/files/ckeditorothers/27561000015.pdf
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210910042103.pdf
    • http://nature-revive.org/files/file/77290647129.pdf
    • https://dom4m.com/userfiles/files/wanajixutanumugozudewobi.pdf
    • http://lycee-elm.org/userfiles/file/bomugojokel.pdf
    • http://websurin.net/UserFiles/File/xigeliwu.pdf
    • http://sensi-leszno.pl/userfiles/file/38096062575.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/def06df5b1c09e910269770e12e8e737/47345040790.pdf
    • http://prakseologia.eu/userfiles/file/lajedakefabatovan.pdf
    • http://kowalstwwo.pl/public/cms/images/file/rufajeferevenokakixogam.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/putak.pdf
    • http://52963566.com/upload/file/202109020520269461.pdf
    • http://szcftz.com/upload/lijovi.pdf
    • http://piotrkowska77.pl/zdjeciafile/88679114240.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 16792 bytes
font_01_sfnt_off0000cccb.bin
71a395ba2e79c5abbbc7ff91c3b3ae36cb1b09c14d6db03f9f548256787c2023		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 10840 bytes
font_02_sfnt_off0000e5e4.bin
c73720fad6c995a4416505fa197368f5c7163def9cb83ce2f1f32433abbb8e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17096 bytes

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