Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f32bb2f029b6aa0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 20:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26e2707f10c10aa17e3d762d9039588f SHA-1: 96af16e541a4ec350ac45653a64ff47b0e767d8d SHA-256: 5f32bb2f029b6aa014f1a5c893b641c6ca0aad5dddb9593086d2abc7f66e85c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific exploits and the nature of the URLs indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://ruh-center.ru/userfiles/file/34690316680.pdf In PDF document text
    • https://steklo-shik.ru/userfiles/file/61804658152.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/soxuxaxoxejuvazijeko.pdfIn PDF document text
    • http://aurora-c.jp/files/files/19759974660.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/76188175897.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xonovusezijujexefemedef.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/66998362673.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jurobevonekageromegakazoz.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/norumetululod.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/fapurujijetazi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fa8366a6---naworawurevi.pdfIn PDF document text
    • http://strap.sk/uploads/file/fajogodijujufijobe.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/86849671370.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e6a5063f64f38efbba4a2859aa3cf394/garizewo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/51216122763.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/regoko.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/76872344287.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138fde72e037---janikudarofodibunakavos.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/kepetesufomilarudegav.pdfIn PDF document text
    • http://nensi.si/upload/file/57359899238.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909211157.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/mubizog.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c2d72eaf7ac4c570e881d846e28e2bac/51378576905.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/romuzawif.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/2019290895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+vice+city+download+for+androidPDF 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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 10740 bytes
SHA-256: 1b6f1dd5935130972b29329bd89b18ceb13ba3fb1bf9405f374f8003ea61f9ea
font_02_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 14256 bytes
SHA-256: 8e97e0fda18fe90a0d7b25424f81be9c9b53dd36e23d90c8645c61ed580bd52d

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