Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d9795743623686…

MALICIOUS

PDF

144.7 KB Created: 2021-06-26 04:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 195bb41c2c9de9f99d97eb0e892704da SHA-1: 483cea70278836f36e72cac3551899076c5a70f2 SHA-256: 82d979574362368645aba66f2c714772cf94eb2b4eb860fd9b630d0bcc9280e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/640d082d29320f317d47054b4db97f34/zadobumezitaruga.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/beg1srd6aqkve428eh01t0dgo2/lebidomedafilet.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e77dcc52b---60216644663.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d6da6528---guzawefozurifipiwemirag.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/73dbd134a5872e12930d020678f5d2ae/16679329332.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vadopevejepawiruzuzadawij.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3bf700c557c5ec093ae497c6ac588d02/60804412243.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c859f384e23---52840708300.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/38673109797.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fokigulinogarazewudepos.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sifekazok.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/crkq2ceqb4f87rlev13qf78cu3/dodemugos.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/68742303958.pdfIn PDF document text
    • https://ewt.cz/res/file/domisodakiziwov.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/bfeebd42b150255d75fd0d1679b9f17d/lumenolokezuvova.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/27523982929.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b180499097dd456c1e03379d942b0831/jakimukavewabaxapavewutox.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ioqeq5kdkmkp2231rgdg8ad2g4/bojugilusanumudenofiperil.pdfIn PDF document text
    • http://bjjiffy.com/upload/26754937804.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e51366577d64079ed503dac702eef115/80158644077.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/44b19009a38ba4a78f48192502cb0b05/ligix.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca05993c---nigidegododilerorariz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5c04a5b6---71760405574.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b6b8aa8b06af96f546bbb59961facc7/xegikotizolavokerixixusel.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/75stmidk3jh6i08b0bc3nbo58c/xududexiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=line+of+duty+investigation+armyPDF 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_off0001d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D78E 10888 bytes
SHA-256: a983252f2bf11fe7caf6c437e05bf4c4644c69747b5a4d5b8577e8e465801541
font_01_sfnt_off0001f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F096 17352 bytes
SHA-256: f16056ee4dffd29b22a610f32ab42a6317202978a0f25acfbcf154dee2168d00
font_02_sfnt_off00021cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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