Malicious PDF — malware analysis report

Static analysis result for SHA-256 9868c82a2cfffdb3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 05:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab61da051f4c3501a7943ff44a77ae8b SHA-1: 6ef50095e9d17b645b173a9172dd0d039def531e SHA-256: 9868c82a2cfffdb382cac2e283db9cdf29defcca5fd418e6e1add2fada818f31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs and the heuristic firings suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ohxto.com/uploaded_files/userfiles/files/45073501520.pdf In PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jimitefot.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/mudameku.pdfIn PDF document text
    • https://linker.tw/files/52772484307.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/48021153855.pdfIn PDF document text
    • http://epmachine.ru/d/files/zumilutetazixekijebu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/486b3a783ee5fc542c5d919dae014fa3/kavirigireki.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a0ad0fdf16fb4f8536a62869fc9f4f03/diwusiberatud.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/90265635094.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/60105882556.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4ab0b483---27092632091.pdfIn PDF document text
    • http://foxadv.net/file/53703587355.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ok0uihvm6eu00k045nqbcsdlq3/polaromubemejinafuripe.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/madegebimukemiputufewaju.pdfIn PDF document text
    • https://avenue102.com/uploads/file/61290744250.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sirilabavuluzagodag.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/93563429954.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/19011029106.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/pizometifusevelojug.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612effdc99f7f---xosojubuwuse.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/14986359614.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/wutupapomuruxajazogefu.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/badadakorub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=share+my+apkPDF 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_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 10168 bytes
SHA-256: fe1e68205025f98d3a568ec0d2e923e9b2f6773817cdf72955d203f2b3f6bb6a
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 17876 bytes
SHA-256: 1b6e2bda01730aebd4f149cfd506f7fe862300c7c13bedd8af09a6e7cd991ee4
font_02_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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