Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a445cc088d65763…

MALICIOUS

PDF

182.8 KB Created: 2021-06-19 21:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2a394bced0a0b1836b4d5b24f6e97bbd SHA-1: 0c584fdb205b587ea4f329a6c229f134a8cdf291 SHA-256: 6a445cc088d65763decff16cfdd99b105cc2ac43eab72c593f71b06bef1da491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=jackie+chan+movies+2020+tagalog PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70cf02b61---77986585893.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/silotuxawar.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8cf0fa3b74f3241f81e3bd53654be9d7/38635807791.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085548751cc5---65568118222.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8db1730a---12409269612.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4t5c366e5vr0kueb23k9n7hvjd/61017609235.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dcjl8mslkd7q4ai66q44kecva1/neverab.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5d49e64aebd7420295ca5a895582412f/60703462074.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3p1sc2mee9dkftpfqn4ss4n9ol/kowonifavuxot.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/keocs5sfe528cgavj051p1fnej/diwudikebo.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/84848232268.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2536c78816---93167955219.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/be386djrfibsukpce2hucqdmrr/15661628983.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96549041512.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/93595020561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E033 51176 bytes
SHA-256: 392dde67a1aaf4a9ce1ef3684e0da891429b9a2748bf98e5c2db7989ea276299
font_01_sfnt_off00027d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D1B 5292 bytes
SHA-256: 1924e366a165a2fac6e87f4a1858f036f37462bfa1ee19a9a3a45ae12b28df2e
font_02_sfnt_off00028eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28EEC 15036 bytes
SHA-256: 431c7eeb339b8fee91474887af2149deb9c8cfd69e6fea9aaa4229b624cec2db
font_03_sfnt_off0002bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD02 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e