Malicious PDF — malware analysis report

Static analysis result for SHA-256 4585013e3a47067b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 20:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4de74009464b9b4880f8d0c99887ae34 SHA-1: 8ff81430d4bfa58fc4cfbd2454e826015bc30f11 SHA-256: 4585013e3a47067b3654c3468c4543d922f83b257dfd2003d420cfc678a50be7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or phishing. The external links indicate a broader campaign involving link farms and potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=pokemon+special+pikachu+edition+rom PDF link annotation
    • http://www.verneteco.com/ckfinder/userfiles/files/69557232222.pdfIn PDF document text
    • http://kahasat.cz/data/file/41370431491.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec3a9d4f9---2564404041.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/memeravizir.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/fudumisakem.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/84435082817.pdfIn PDF document text
    • http://dmkert.hu/files/file/74166361252.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/kovomanafek.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/69998926868.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sekezoxajegip.pdfIn PDF document text
    • http://sung1.com/upload/files/fiteniraluzep.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0ddd88eec7d6d50f338a572da5942215/mujalubagogud.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/xodidulutuxivoguzebuza.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d19b0d76---8966317446.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xivik.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/47012168267.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/lotiw.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/matuve.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/10730881512.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/tizojanenafufosigezas.pdfIn PDF document text
    • http://rayer.cn/d/files/6151461836.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/80800794077.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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 10972 bytes
SHA-256: 2bca6516a02f781ccadb7c4f2d74a19a674eaef5657c485583db2be380f35b64
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 19236 bytes
SHA-256: 416318379f43a59bbb1ed29a57610c5ae3fe6e4dc0d4139e2a3e571131c7f752
font_02_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1