Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96f551962e543e4…

MALICIOUS

PDF

86.2 KB Created: 2021-08-09 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5b33410f2f641c36d4e0a0ded690890 SHA-1: 47bf6291a188713888d0edb9bb86a71092c234af SHA-256: f96f551962e543e4ef66a611f2ecdad2916dfb68e3e0ae275ebe72d2ea4bf6e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=how+much+should+i+raw+feed+my+puppy PDF link annotation
    • http://pallenberg-busreisen.de/uploads/files/58342911325.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc7bac291---60918771940.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc003a5c2---kozimixamofoja.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/75172109114.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61758a377---85790943127.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/44a5629575ba900408d4f4278ad69206/38903266855.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/82221852917.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/88743204261.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/huh410o8781rdk18hthu097ng7/93447784297.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da518f95a1a---zebijekuperilobakanamif.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cca279d6---32039160824.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3s7i5ivm26991q8n6fp9919do6/bowunonedosexure.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a93e3d949b8ac099e91977e76a64647/jedawifini.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/fafiz.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/27613232813.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/94892674846.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/2145187851.pdfIn PDF document text
    • http://chemicalengineers.ie/images/fatilenuloxu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/4560138096.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/14841321541.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/vikaxowivafobefepexow.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68686649029.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/21244821684.pdfIn PDF document text
    • http://wohingltd.com/userfiles/gemapivamoledogosixitet.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ef3c4df5---84000361413.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rawawevimuzajipizenogazo.pdfIn PDF document text
    • 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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 17076 bytes
SHA-256: cef8469b99dd5aa1d4f7044601b765f183b242333fbb06b83b3c71819e4731a5
font_02_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 10972 bytes
SHA-256: af50b61242fdd47e43af11ad37f33186bdc97819d4b57c2455282605057710fe

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