Malicious PDF — malware analysis report

Static analysis result for SHA-256 72206e76c91d74da…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 12:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70a21238146583f9c286d9bf085e9ae0 SHA-1: c93f71af5d6a0b79f5fbb0db171765dea008bac5 SHA-256: 72206e76c91d74da1f21e8089d8462ee68e16c1c0a2111e4750503a0dfaf424f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The presence of embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=rgb+remote+apk
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/45439841324.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9adb53ece16f0ee6a62fd968edb9dc15/zumitijarabejawapokejiw.pdf
    • http://eraldocomo.it/userfiles/files/82047171470.pdf
    • http://etkindenetim.com/resimler/files/rojowupugusalubitabive.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/58573152814.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161392eb0bfe75---72084945766.pdf
    • http://embody.box8websites.com/ckfinder/userfiles/files/40553109560.pdf
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/wukesitonoxedetirifoz.pdf
    • https://imotrading.com/images/userfiles/34871442753.pdf
    • http://china-shengbang.com/upload_fck/file/2021-9-28/20210928105738263308.pdf
    • http://mondoacquapiscine.com/userfiles/files/loderikobotawozuvudiwu.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/gujevofivalawiviteba.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/zukininibodexomadegaguxip.pdf
    • https://valstybestarnyba.com/upckfinder/files/32830678649.pdf
    • https://siemreaptraveltours.com/userfiles/file/mawefivixof.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210920_FE5DF845C3F26509.pdf
    • https://renhedc.com/uploads/files/202109061303199879.pdf
    • http://gradn.ru/uploades/fckeditorfile/35975240726.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210913_154534.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/dixerapaxatabomalalu.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6b33a2a73---8450897566.pdf
    • http://uniquehotelsolutions.com/files/others/32849610050.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/tovowidowufawena.pdf
    • 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_off0000b7c2.bin
7aefb0b03bb23e7eca20d7ba6978cc6b993850aba3e0f464a82b5f3eaa1d5ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C2 18192 bytes
font_01_sfnt_off0000e710.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 16792 bytes
font_02_sfnt_off0000ff27.bin
ad4382bf0334ce7ebe98ff08f8d62d6aaddec5d1e936b896d9da2fcfc3300a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10460 bytes