Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f865b67197ae3a…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 19:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 040c1086cd94cfd14fa4225aa29b7395 SHA-1: b481fd9cd17f663516e9dcf227fe8586e64421b3 SHA-256: 52f865b67197ae3a187ff27a8f93dffacf288e510d12a6636d4971b92ac78c66
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains. The PDF's structure and the presence of many external links suggest an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zaragozadenoche.es/upload/files/diweni.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9dac6c4c58cdc576d177a50fbbb381f3/wunotixazajezidizazu.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/wobudivonerudurujanab.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/a3qiif6fha37nqbk174951abid/65317631713.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/nebudotipibisufarajemun.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bevatogixavolomizamefu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/j4eim4dhe3lhvikd1g9ehbb48t/kuvibitubipogela.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0de7dbed---mutikexamun.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4a796ffe86349e29669c03add65d98a1/raramokirot.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/ratimafuwag.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/kenenubirirovimego.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbed8402e6---40968004321.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lodubazafufomuzovuxidutu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/40806261564.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/76a1d8a6f2e18ac5f90e615108a4384c/36222588426.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13831392594.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca8d0dca75---kevakemarozidix.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105260408400341.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/da2d2399c891b9f18bba70a842b9162d/32411390210.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/japus.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2c98f7a8e98eb3f190268f5ed24ecc72/wodogogowupimurewedileb.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c8464364b6140a2aa32117d8993b885a/30756180325.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8744ee18---bobopolowusavirim.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/xukogelegemudupil.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/364533c0ce1a482d1a2cffff3718d63b/jalopoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clausius+clapeyron+equation+examplesPDF 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_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 17812 bytes
SHA-256: d52f4f6a0ed638d3c892910a878fe449cccc3f5126f1fa5844e5ffd0bb152fb1
font_02_sfnt_off00014ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC3 11028 bytes
SHA-256: cb0bd6e1fbd490a5cd8d840f5b1df7208976c856d2d4a7dfeb86e4d6f54ebafc