Malicious PDF — malware analysis report

Static analysis result for SHA-256 e117426b9cb613e0…

MALICIOUS

PDF

108.2 KB Created: 2021-08-04 04:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 826661b9dce8180812f719625c009b21 SHA-1: 3eb43211c21dbdd990c71fe757545bddac44710a SHA-256: e117426b9cb613e0efc04af1b2fe5e60ea60ebf6ceb8ddf7e80b122b3aa2030e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various compromised websites, many of which are hosted on WordPress installations using the 'super-forms' or 'formcraft' plugins. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=hack+sans+verification+humaine+msp PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3fd4041514009360a37e0fab59d120f8/tuzigivezufupuw.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/dunedeza.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/c3pb5u0hi790n7chcs2jmclgdo/zezudagijuwolofekibazis.pdfIn PDF document text
    • http://splogservice.ru/content/file/selalevi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f77852ff---dilemex.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/86207772530.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1347551791.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba63bac43---boduwozugadotolimuxazep.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/9f358280f17b5802a611b234f5347241/soben.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fd8175d42634f735a66ae22c03970893/rifip.pdfIn PDF document text
    • https://hoalavender.net/upload/files/56129952912.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/tosudefir.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bd3bb2229955ed4897988e0220324871/34826852047.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ec87e0d7b90967ac3f916e96a04e97a1/zapupedotogurinibizuzu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e775d2a90373c153a85d0fb116ed8e84/kalazeketodoxew.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tb870p4i26fisli3bj5dssi42i/kopimorezowolafas.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b169774e---takokanev.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1be8c9bf---mibupikudonikuzomasitepa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b089vvjlhcpu4cf3v2lm8asft5/82858094642.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/karabawoperela.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a592a0e36---80735817788.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/80364888270.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098092337e55---wigeminikafititulubat.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3558edf29775552d456aea3967844c6e/vevatuxudalutativugadi.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_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 19144 bytes
SHA-256: b9d6c97824dfab2e932b398ecf8217ecc155554d2e3f3c2d8d49c6bbbe4706c0
font_01_sfnt_off00016ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED3 10948 bytes
SHA-256: 438fdd8a75f09c65c6b929d6915863304fe19f71f171f5c309941b8e40283fd0
font_02_sfnt_off00018815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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