Malicious PDF — malware analysis report

Static analysis result for SHA-256 22071c7590e0290d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 21:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80fd414cea72834f44fec61efa526414 SHA-1: 4b565a40177d93498f64a655fc5a3e614f7aa664 SHA-256: 22071c7590e0290dcb4b8a10743940a34566552d721f02df108f961cdbb1eb60
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 disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://aarogyamedico.com/userfiles/file/womowemuximerowibusozi.pdf In PDF document text
    • https://ambalatender.com/upload/files/zigasibewosuf.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/zobotuziridizit.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/88155003994.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/xojolepogotasesamirax.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/88801114823.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/79643448519.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/90319794407.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/94675071575.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/21948134555.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906084824.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b55d05a9---tisutopopezojebewu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_E3B45092C72A0D3D.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210902223245.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905031309.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/44882983222.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/futeguvajegobagi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfd64ec93---kideju.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109062334532890.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/92169635017.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3p2brf9gtliqieasaons5dne35/49571144520.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/35499965727.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/34352013114.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/41270083992.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_92814E6AA2F35366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sunk+into+her+full+moviePDF 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_off0000b8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 10484 bytes
SHA-256: 42f026a47a66d8a450e5482a4d7feb01383e0c8202c40a9d324c2a18722d047f
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 18596 bytes
SHA-256: 17daded44f383f4afb790489e54e2e00ad20fc0a96275d2ed86869ed05b2177f