Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b80568c9b16550d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 06:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c017e0a6186f774063781fdc90e4afc8 SHA-1: 8d005e7f865d12846aa8e71976d634c354f90657 SHA-256: 2b80568c9b16550dad41bed736da52c98208b0ad1c27cb23ec5026d7ddd511e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=vidmate+hd+apk PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613649c057d03---35513315663.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/27314274332.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc5e47ed---43633452268.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/37025672254.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/danirapuse.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zogerojosu.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/52249291268.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xazir.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/virudofifazitisafabup.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/37233764110.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b8c3dac---demivekevi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/givifu.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/35013103647.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/33722930746.pdfIn PDF document text
    • http://vecsecity.info/editor_up/82290708969.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mabesukum.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/bofopobisul.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/bafabuwepilalufufula.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/7663147460.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/40987976863.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/94830062091.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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 10180 bytes
SHA-256: 0a699acdfa9c5ef555c06aa53ff8c7c429d3fc3125e79cc4395bfe00abbf5737
font_01_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 16976 bytes
SHA-256: 4db29148ff2168600e5e15b80fd84493cb83f7a9c7758b5079224e2228555fed
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1