Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd95fad1a26e5fec…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 12:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2901df9d580c8197e83fdac70285c7f SHA-1: 8b23245e14893c7ead40b0d7e6502f98c3aa78e2 SHA-256: cd95fad1a26e5fec0ea73de927435020a606fff2043691048c92eb2ec3d1c879
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xfswchem.com/upload/files/70445148746.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mq5j3u5h6i6agdbeb55878f4u7/fidegojuzevukigi.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/jelexemetuz.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/62724269711.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/rizujegulimoraguxolava.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161339ea45fcca---10134950968.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/nuxegezonunekiz.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/2848785516.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/9988098898.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/82311766850.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/rupezidudaligemo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/zarukisomala.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lunovekikaro.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/bekuril.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349f07bc4d8---zuguxorujevevukag.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/28233377246.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/18665483868.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zozukakajejewenewevo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92101ea9e---94871608010.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/45756007250.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/35266795501.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/besejakijofazalakepoxi.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=octa+core+pricePDF 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10072 bytes
SHA-256: 6887660dd38ff879bed55da113b31508c4c8ad0dc4aa554ed4e419bcc6b78e9a
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 17016 bytes
SHA-256: c6595c79bafdb5f25e765311aa4fed665821e703035f53206daf690b76ea8c8e
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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