Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d6df77ffd6791c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f722be8826eee93012baa5043bef383 SHA-1: 7029169bd01da3055a287dd26cf39ece684aafb6 SHA-256: 89d6df77ffd6791cd83914c607a71c343217081f1079ef2c8d54c1062bad5c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing/trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads, suggesting it's used to distribute or redirect to malicious content. The PDF structure itself does not contain readable content, but the presence of external links and the high detection scores strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ukrfirework.com/images/file/28284044383.pdf
    • http://chelseafoodmart.com/uploads/files/3658623537.pdf
    • http://gayaarchi.com/userfiles/file/20210918200009.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wuzukesejidukusufokajez.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdf
    • http://livelyway.com/ckfinder/userfiles/files/konogaxavuzofebutoguke.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdf
    • http://soyaksiesta3.com/userfiles/file/jenibiniwozewekujix.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/penugugawirivasiwato.pdf
    • https://hoakhanh.vn/uploads/image/files/11367259165.pdf
    • http://burattinojatek.hu/userfiles/file/11598239503.pdf
    • http://lenosada.sk/editor_uploads/files/womokakikinagezu.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631310805.pdf
    • https://jgranit.pl/userfiles/file/80800518941.pdf
    • https://betenagro.com/sites/default/files/file/dolalunibibebe.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/48802553043.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b13bd0cc0d4b1019aae7eb6d7f2e912b/salowitubu.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zifitazulufoduwifod.pdf
    • http://falerisztika.hu/tmp/49160339851.pdf
    • http://ebd.su/UFD/7623/files/28404260878.pdf
    • http://hongdacable.com/d/files/84023844194.pdf
    • http://dealershop.es/userfiles/file/nebogununupetoma.pdf
    • http://cjatkinson.com/userimages/3061583875.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9dfe0878bcb852573a0612f211062a0/sopibovijepini.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=romance+movies+free
    • https://rt9.rspo.org/ckfinder/userfiles/files/86142530602.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
font_01_sfnt_off0000f59a.bin
b0dae8d75d37d9345f2ec9210f549afe66d41470243507e43a5e23cf0123ccc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 10464 bytes
font_02_sfnt_off00010d5e.bin
f38a1b563994c425e4ee732ded66fc3bf26b359b65b5f337b122bb9fa49111f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 18752 bytes