Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e12f6b42048feaf…

MALICIOUS

PDF

101.7 KB Created: 2021-09-10 14:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc8cd66f5c42d8eb23ae80d860160446 SHA-1: 597a16bc87119642876b53ff20e0dac5c6eb130f SHA-256: 9e12f6b42048feafd069f2dcb59a809bab3b0a1e53a8370a24ff0481c79dd39d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://budoprojekt.eu/obrazy/file/serusodumopan.pdf In PDF document text
    • http://assotechne.eu/userfiles/files/damapazuvufurixixar.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/61579748105.pdfIn PDF document text
    • https://pcetravel.com/files/file/79861676371.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/ratozomavana.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_29eed.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd29386e5---fezonafov.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/noxebeb.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/52409706546.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/kotito.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/91058319686.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606dd25e04---genikajenudi.pdfIn PDF document text
    • http://telecycling.info/files/file/76372500094.pdfIn PDF document text
    • https://clove7.com/userfiles/file/87758839857.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/27775022817.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/67871260818.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf5d11b0b---vepowupuvexotovoxudu.pdfPDF link annotation
    • http://chemonova.com/FCKeditor/file/83463198316.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/30315753016.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdb814d6d---38645789904.pdfIn PDF document text
    • http://artediapharma.com/upload/files/berogojifakuwafiwezenegar.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/83216161070.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/81840394863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=world+cricket+2021+game+play+storePDF 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_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 11244 bytes
SHA-256: ef593cbb5d48d598ae67c3d361d4125bb32d7d5572152315978215faf97a9a2f
font_02_sfnt_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 18912 bytes
SHA-256: 0852047bc3624ae0cc9a2a7cb53ea654cdd419187a607aeeb89b7f07a290c8d2