Malicious PDF — malware analysis report

Static analysis result for SHA-256 5526a50d060fff6d…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 01:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 500e0a5df42e56aa3ed7bf548d145c75 SHA-1: 68b46275629615dd67bb5ccd12cc7c96e8da8483 SHA-256: 5526a50d060fff6d05945680f8fb72c13513cea56695a36c7951882057df1602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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 http://splhardware.com/UploadFile/file/2021091516115173499.pdf In PDF document text
    • https://berbagiangka.com/contents/files/32367859020.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/gugelezazedeve.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/larimopurabeko.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/57685086401.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/xusinarusolebanapirolen.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff61c07067---58803427766.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/sisoz.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897401ae35---24551977867.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/mibaturo.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/winegixuz.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219131116543121.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/vagagipejalegike.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/40854201404.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/kegogeraf.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613610d99bcda---gagabagajijerijebifagesi.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/73648680250.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tiginaxofolawobasiwolepuv.pdfIn PDF document text
    • http://khocabien.com/uploads/files/29321520999.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/vosabug.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/vimewinuriporadaxuzaxu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/35836266521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=where+is+my+internal+storage+on+my+android+phonePDF 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_off0000ace9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE9 14480 bytes
SHA-256: 02800f700a2236e4d0b2202e7aed9774aa5f32442574ca647628918a39742d7a
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 10948 bytes
SHA-256: 81830f0614c451dd2ec5409982dfce071083e9400f842232af62e373c2246399
font_02_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1