Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6c5320e4259a5e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5bb4ebde5b3c883bbf162d909c7123f SHA-1: 98bc2dee6aadb4170117d6919e48f73fa8fd10a7 SHA-256: 6f6c5320e4259a5e9695518a030dfd91127d15a7b4e5ff60c23df7152584b221
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests an attempt to distribute malicious content or phish users through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aranysolyomfeszke.hu/editor_up/41727420033.pdf In PDF document text
    • https://amblamy.ee/upload/file/68606288045.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/tunafegolexesel.pdfIn PDF document text
    • https://medtek.vn/storage/file/42512463574.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/17884288673.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/44056526658.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/11084796460.pdfIn PDF document text
    • http://darec.sk/files/files/sibusa.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/85621445587.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612097acbcde5---24488081154.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/70264213116.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/tabubuso.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n709tgeq3909i6jh8uo4k3q565/77504110001.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/12809564592.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/30451330845.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zasugebabawukokibi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c82fbc83988469e361429f5eebc891e9/keserenizijibujevikomol.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/24181614964.pdfIn PDF document text
    • http://mousike.it/img_ins/files/minupireti.pdfIn PDF document text
    • https://numberonerevolution.it/file/beteponaratopot.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nihho47igeb9ijuhuoa7e0ak81/42547369086.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0c75ee920340d2ba6543e30915d4c77b/30102094859.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d1e40f3b---89114939241.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/nogalavejotulojodagesizi.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/49448680904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=crossfire+entwined+with+you+pdfPDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 17108 bytes
SHA-256: 258a257ef6789acad18395a19d43034dea0053008f6a7c0755ffae2ad2a8e683
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10716 bytes
SHA-256: 9645f93185909c796bdedc7794b6f0dd98685ce3a1fca4e54fbc82568d633ba4
font_02_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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