Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9202f38b8e663bd…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 05:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c9770d14793ed7bbe758c48d0d598735 SHA-1: df838dc9b8fa8de488a0667644cbdadcb68778d6 SHA-256: d9202f38b8e663bd142084630e5712cac8b20968dc7d51aa65cdbf69f1b7605e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://anakmeong.com/contents/files/46825728087.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f4f41900---73535489005.pdfIn PDF document text
    • http://unibox.lv/files/text/26104724016.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jepageg.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/1252140107.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/vosovepilol.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/gotubukifuxadanewogirija.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/wenepafige.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614da74459ba4---ganiwuxexokeroxazaren.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jasukajogam.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/kilifofopivatikif.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tulezinuj.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/40819392628.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/91118712750.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/jodiwaxodap.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ce01ece772dade30f09ed4ad141cd0d/94775231863.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/25554753337.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/59178167381.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1858bc794c54af4f19679f9b778dbb99/gawemanofosusawubotijumo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/57242930323.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/8115324367.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/dematimuxerupasojanud.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31616533215.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/wexifomevixa.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109180701169202.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/79562107290.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/folujuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kingdom+rush+frontiers+hacked+apkPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 14020 bytes
SHA-256: e35866e4cc611d105f4ea4bbbaae348455b4a20d7bea091e78f0a32bc3e46f06
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 11204 bytes
SHA-256: 54178a5ec818f3a4997f15ff580bf2b8a1d695cc19c0404cc295ae342c75c2e0

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