Malicious PDF — malware analysis report

Static analysis result for SHA-256 12094095dbeb56f7…

MALICIOUS

PDF

84.5 KB Created: 2021-08-13 14:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb6efdd64d1109d646485f886aa4af6a SHA-1: 3139fbc18c874e3b2a7d900a85718bdca540af9f SHA-256: 12094095dbeb56f7638b18061d5dd6f9ac4581a1f40a149128d4462415aecf8f
176 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 numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://koslita.eu/ckfinder/userfiles/files/lemoxokilivek.pdf In PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f00c9e70---91518692676.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b26af454---18913587513.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210725033533.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3da23d33dbc10505e122931330012bf/pakuvagupugaguluro.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c8c91c890ef6b7c00cc6d7231c002eb9/19526585534.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/tadezexenutaxopabosaru.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/65406999883.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070fff721da0---roxixojipojopad.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85c2d74ee---dadiribikoxeluwiv.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/dasojebalus.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e9e87106---paguzedenowoxa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc43dbf38e---linimupa.pdfPDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21227e1d5b---jelixibazozimodebuf.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/jaroranuxolumi.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/porevixakum.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/fudanagijuk.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e674c94c66b40b63dc6bc94fea413096/bisetafilopafisixafibaxut.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/gomepumibogepika.pdfIn PDF document text
    • https://amblamy.ee/upload/file/68637443482.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/vuzirosibovemavotegivos.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/dujesila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+cite+apa+pdf+bookPDF 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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 17488 bytes
SHA-256: 8e5532c6f02e20283ab1cb7e030de946e8b5c9f68d28e5c8afe94855a51c5d21
font_01_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 10504 bytes
SHA-256: a751601d382742c6d4771e7faf261cdfceaffbed8b72430451001aacfc6a25da
font_02_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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