Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9af9b344e4de1f1…

MALICIOUS

PDF

79.0 KB Created: 2021-08-19 13:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8049159ac8edea295bd16fa0a9d62c2f SHA-1: 9d57bdc1532c32b90d3e3496167f77343497d626 SHA-256: a9af9b344e4de1f1eafcbe046c3f3097a2aaad57eba926f907b46cff02cbeb31
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://samuelben-horin.com/userfiles/file/woweziwef.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5d5d3110f4b7aa2c6ad1fbe20639cb43/wewemuredidog.pdfIn PDF document text
    • https://majubesar.org/contents//files/fekagedinujekejijadukizol.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/sutus.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/wopik.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b23bb6f---zimonupo.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/ab4873024a1a18d0d8c674181a606b12/68129990631.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83b68a206---fifibiwo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160812097eed00---53836699239.pdfIn PDF document text
    • http://ranch.pl/files/file/25774905732.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/lurelobufufonepivup.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/66572594395.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xopulatanovojoxogenu.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/8572245671.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1941c5750---kamixesovufetijak.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/wenapekeduwit.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/43bd11e0b0d98243851adfe75269594a/42598841651.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/jokisi.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wogebagigabekapi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01c0a4146---5647856327.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/55704924135.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160729815438a5---lobiterijovowadojopo.pdfPDF link annotation
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kokibesaravifijevuw.pdfIn PDF document text
    • https://12shio1.com/contents/files/sazanebapimekofabojowir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=por+que+a+mi+valeria+piassa+polizzi+pdfPDF 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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 19124 bytes
SHA-256: 334f1317e073142dd8481ce038895a6b8336d2431cc7c40613690019e12f8bfd
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10832 bytes
SHA-256: b4a75cb0ff0cdae6b4d869f36e3ee1e91eda1fdad1580bd3f91454d12fa8425c
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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