Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6161f1c352915a3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 19:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d03679858cb79c714846dbf30635c2d8 SHA-1: 6fd30449fdd5fd9e278fd510fb86f06557e70236 SHA-256: c6161f1c352915a32590ecaa134b121b3e0093f22fa718394f4082b008aad66f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. It also features a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or redirection scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://usateatop.com/_upload/files/22487788900.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/03971fc682819265e7fc349a369ef53b/tegigotixurizatatawuruni.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f066cb0e67243c64dd78bc142509ab7/65295241198.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12498719993.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/43603485355.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989adb6e25b---tozekewurufowuburidofavi.pdfIn PDF document text
    • http://www.bash.cl/media/file/37085991415.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4be36e8b4c15af656430c90eb0b56aee/rifimawex.pdfIn PDF document text
    • https://peterdegendt.be/file/vuxilosaj.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/majixabasaganixepupe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/47916e6d1e31e8b629021a127ef19914/lonaxekimiwijawo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f03ce1369---pukolobozorowovowexotosu.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/62320693817.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609417a2434da---bifobemelotelanumenexoxep.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/feveruwawafaz.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/gimegilofoziluwipalit.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a304b57---31411040543.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fhag91l2q8vsepqkrhv7lmboi1/xanagejutav.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/57893112804.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ab8d1bde---dufonomisa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/h7ueq7ger3badq43da4vjuvdmj/37010278792.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6clethdqr7j1bs2v8aip1kg0ok/4689153357.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=coordinate+plane+equations+worksheetsPDF 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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 10944 bytes
SHA-256: 103cf12f77ca741755dba6bfba33d57f533cff53de23834bafce092cb2aac045
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 17000 bytes
SHA-256: d55c8ab08b736e34fd3df487178c9c6c7d8c4d3af5e77fa5d68fed7e12efedc5