Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e70e95f6ceffb5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6b9b597d70eec8b12ccc7da7e6e9707 SHA-1: 732beb1a366f22b6b77ab79c5a0971ae0396169b SHA-256: a4e70e95f6ceffb568dea82b97edc3ea44892f441087cb1acfd66537eed211af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. This pattern suggests an attempt to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.bongbansaigon.com/uploads/files/mutemebobatef.pdf In PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/zivokosewuvojemibezisa.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfaafbb72935d61558c84b1f1db2409/turekimuxodadesikilawoda.pdfIn PDF document text
    • http://wsm.hk/images/files/42030750803.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wijew.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/08d1679b79a839719f09dccced8877fe/luxamumadiwobama.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/bizutovezejasuzaxabidul.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/76478459404.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f20f7fa---sudemelole.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14468080342.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/xexabawiparufil.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/nopubos.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902141158.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/xotex.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a25f580d2f4c47c5b66d198115e4e1bc/73794384570.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/978096408.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vatuxuxonagavaluzovof.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/62271236673.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614009f3ec0db---93577761343.pdfIn PDF document text
    • https://novitas.ro/files/93260284549.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/gakakazonaxabofupa.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/zepuroxezimoveruvu.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/47513896379.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xalowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=board+kings+mod+apk+unlimited+gemsPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 17328 bytes
SHA-256: 4ba08aabe537e617802fd7bdbe99f6ba76a2ef839f722fe8c77dd9f7e1e1148c
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 10980 bytes
SHA-256: e9a7bae2148538237df1b7a2135799982e992f079f5c7e8cd58cbeb77179789c

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