Malicious PDF — malware analysis report

Static analysis result for SHA-256 db104cb5d1a0dc98…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a469f9fcd3aa94846278c624141da41 SHA-1: 458413d83f238a0cd5ec8f9c7eac5f9c69eabac2 SHA-256: db104cb5d1a0dc982a8b8fa1e67ab3a4c49bb840bbb02bd3bd1724d2e7989c51
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms and compromised CMS uploads suggests the document is designed to redirect users to external, potentially harmful sites. The embedded URLs, particularly those hosted on compromised or disposable domains, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://stroisvias.ru/userfiles/file/27908051861.pdf In PDF document text
    • http://akbarestate.com/survey/userfiles/files/24036859484.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/52837661566.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/nojakum.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5469121eb64a4816001c43a89670f5f8/betubanunavuwagizawopavik.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/55042029470.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/735acf64b5ea2c0a2f31467a699868df/sizariwifajapoguse.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/tosurepu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c35c95758816611e74e18c92830a49f4/bexipamexozoxafaf.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/wadobezesazonebuzumaga.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210908165610_sifbla.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/30257ba6f26b3f1d23884b2bad63aea4/80076009989.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bilelodali.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463f9eafff3---rifuwigudiwiwaxilibuvip.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/gotejivozezuf.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zolifuwunejirujov.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/81558745868.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/turonimevojoxus.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/37152015012.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7tk6jdgrab27jkial516f7ld90/80781440022.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141547391ff3---demiralajizowuzuba.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/bipojarikixerum.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bavifebariberejunog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=master+screen+recorder+pro+apk+downloadPDF 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_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 10588 bytes
SHA-256: 47bcefb35933c0658f9f467693abee42c1ddd9431f73b5f4bc13ea73049fda7c
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 17140 bytes
SHA-256: ff5232c3b0ee939316329492a4f5f3f39435cd21bcd8d292fcefc551a916738e

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