Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9c98ee889954bb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 454317230c412afb18adb5b1d2f8a820 SHA-1: 9568a6152349001afda1a1a181e0597d8adf00b9 SHA-256: ed9c98ee889954bb4755aca7b22f300a7d8e2696c36b59b54365733347e5f81e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://chromavials.com/d/files/27353273361.pdf In PDF document text
    • http://risorsaterra.it/userfiles/files/41027808226.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad290195a---30174445767.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/nazevojibasuzu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/560d95a296f5aeef6f7486cbbc861cb9/33243413956.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/69685290512.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c386305493---59263792625.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fd5bcb330---48978558306.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///28194764553.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/13792813203.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/vekized.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7371f77ekorng9spgg0toel9fl/zegoniwafup.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161404d1714065---27048548164.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/86457079520.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/sopikojalivu.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/nokawasusalu.pdfIn PDF document text
    • http://yuli-china.ru/d/files/jinemabutujowave.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/41491306523.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kfms0es5oeoni06vb9njlrpbo5/58013070557.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/sovon.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/66144291096.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ee0f1df9---56580185147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=multiple+gamepads+androidPDF 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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 10828 bytes
SHA-256: eb12e33dc77db26cc7ef4df4af99e41576fb71e089e40d20638e72fec7e59d54
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 15488 bytes
SHA-256: 4f881ba556d08d595076a61fb0a2abb66eab773de9307bf8c54d50e5a23d0ca6