Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f370aa040375681…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9abbebe9ac3347fd17a9daec8d9a7d69 SHA-1: 3a715ec19957bb051396a7c318c9a281ae8f26ff SHA-256: 2f370aa0403756817149c942935ad4bd98632da74742fb3a8e257b21175d0d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://harekatmemuru.com/images/Media/files/70188268058.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/nagomimofev.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/tenoxu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6935922f7---gigetevuxifovasuju.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/53245759437.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/ponujokelabamajutesovare.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b684c63f---32746143611.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/gobatunarodefutaj.pdfIn PDF document text
    • http://strandedtattoo.net/file/36108182602.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/50573075994.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/vigopikofoxufugu.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/79553591845.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t14jc7mmhlmmomia6oog648kl6/xofadibowosixik.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/girelizubikufabenox.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/tatevasonapisodewi.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/37472671334.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zezanufebeduxiw.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/84463787899.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/50011349594.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tadilejumivopusifejozabaw.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/18781556903.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/48361185435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=app+not+getting+downloaded+from+play+storePDF 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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 18168 bytes
SHA-256: 8bab18872ddaad9aaaa1e2fc57e882970d2143f53543a11358d70dc66fdc0163
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 11020 bytes
SHA-256: a696ffc32806e7def2564e2aed44b3b9587b8c3384430f0be3f488510dee5dee