Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b15dff3c153038…

MALICIOUS

PDF

76.4 KB Created: 2021-09-27 13:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a14c9520b63bab17a305be5d771aabf SHA-1: f3a3c5804b968871f1134e8c43402a8ccfa0ab62 SHA-256: 60b15dff3c153038c065485724105daba14c2c9ad993907d2e542c2d0bb97a2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catamma.ru/uplcv?utm_term=highly+compressed+ppsspp+games+under+20mb PDF link annotation
    • https://v-rshine.com/upload/images/files/44196750289.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/64444680766.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092401054773499.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/14089116277.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/61280078246.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/5631406871.pdfIn PDF document text
    • http://quranday.org/userfiles/file/81428718346.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/58765272288.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/5732129968.pdfIn PDF document text
    • https://cargotavio.ru/files/file/64909245883.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109200200312617.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161482103925a5---mesasabegagape.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/xetomumanida.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645d8d9639---82837701038.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bmfpbj1vv0okgh667ikdab7tb5/17546333538.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614923a45a7d5---83567209504.pdfIn PDF document text
    • https://ghnservizi.com/file/mometawa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c583a44c---43833838531.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/tamamelanabikinuxup.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421cfe911a---33828840483.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/simirisofutonifuzidulugu.pdfIn PDF document text
    • 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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 20488 bytes
SHA-256: 7dc3b544415ceb5173a20cddbc38aaf6130eb029ad7edaa4728a884e0c0daf78
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 11452 bytes
SHA-256: 39c29b639d50826c9c6b911c34a0081859551e5bfc2c497de40323269d0b8184