Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4d52150f66a9b3…

MALICIOUS

PDF

78.4 KB Created: 2021-08-02 19:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e807fe1ec9feaf970616c7a252d287 SHA-1: 4f6c850e0d6ab2f2a809a2c02279d3cde6da684e SHA-256: 2f4d52150f66a9b3c34ba112629fd866baa6c4cb62e26019d50c89d58d9f24bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links. Several heuristics indicate that these links point to compromised WordPress sites and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/334541a03348b7917c642457fc09d839/9864899742.pdf
    • http://aqbnb.com/uploadfile/file/32149093610.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2358678c26d2d43c400b81a4539cb394/zuzufivevi.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/61gjicesiq4cgdq2ts1aac45tr/veresewogedefabaw.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/fovezewuvupexudegofo.pdf
    • https://svetplus.com/userfiles/files/wotitanufagugole.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r4215rruj6un1u7h3ek306kc5l/17784282297.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a371c5276c7689a32deca100678d7170/18863893934.pdf
    • https://umartravel.com/files/34414557878.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/rejinebiwurisoruterafifa.pdf
    • https://alperbehang.nl/userfiles/file/motever.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/piramivuxoti.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/80360682792.pdf
    • http://www.monts.sk/upload_images/file/82866342508.pdf
    • http://santabruna.cl/upload/file/94854337721.pdf
    • http://navigator-33.ru/media/file/rotofarugivipomirojofa.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ff769768---80493880634.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/9q26dqcrk7ihahosbah9bhii64/99607279519.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ca37d83e8a0251a7e729f2350bcf5c8d/jetiveberamonex.pdf
    • https://seeyounow.net/userfiles/file/vapafa.pdf
    • http://dtcguild.org/clients/80367/File/46366521946.pdf
    • https://restavracia02.com/userfiles/file/konilalikasusoxu.pdf
    • http://consulcongress.it/uploads/assets/file/49149009790.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1236a86ee7358da211da88b62a397a7c/74598329747.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/39168878828.pdf
    • http://auto-spec.ca/fck/file/91832261147.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=atul+purohit+garba+mp3+download+320kbps+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b3.bin
6b21fe0f9f969b22f830b85d381c3940c64d9950dfe1b99e659be625498bd689
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 18648 bytes
font_01_sfnt_off0000f72b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
font_02_sfnt_off00010f42.bin
4201ef82642767ee9ab6cd36f8ab2367444ca6609d6805b42e500dabec4fa335
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 11756 bytes