Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a0bacfc7781eae…

MALICIOUS

PDF

78.9 KB Created: 2021-06-27 00:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 564995aa3879f2c817fef4064694280c SHA-1: b811fdb3fd11226365a88ddf2880a67f830b7bbb SHA-256: b8a0bacfc7781eae07a7c4be67eba09dc95a188e43dfb2f25d159c890c1d6819
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress upload storage and disposable hosting suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/20cfbaf26e394ad3771ed7835db0beb4/29410343848.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/80636227453.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7ed15de226142f68b3b4a01387d8ccf1/nekuzuluziwibadurusid.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e169bc926f---5244887312.pdf
    • http://ekotronic.eu/files/file/80127955399.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d38f938a74f114e2d6f6158067d1a0c7/gukaxur.pdf
    • http://wahluenfty.com/userfiles/wulowudaruzokabitazigisin.pdf
    • http://nemdanangpho.com/uploads/2021-05-31/images/files/buxepesukoz.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/23252503268.pdf
    • http://hotelclinton.it/userfiles/files/19784524396.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafa127e17---12398555404.pdf
    • https://mgogs.com/mgfiles/file/92482020817.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bc1b197ee7074994b8cc1933ed41388/63140276353.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e63e82c29---12410415344.pdf
    • https://amatnieks.com/pictures/image/60747197138.pdf
    • http://vce34.ru/attachments/file/fugotojutoket.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e71e8f0---tozovapiwizux.pdf
    • http://malagi.pl/user-files/fck/file/joduro.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d12fafb4d336dcc1729252993e848270/89101962615.pdf
    • http://haus-st-otmar.ch/userfiles/files/faxegokuvezexesu.pdf
    • http://svaz-podnikani.cz/files/file/2475781250.pdf
    • http://crosswaysrecruitment.com/userfiles/file/lafowisoruvixigasuro.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66a13c614---13937905814.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c0ec6f6d6c5b83a7404d826256c521cd/15528666261.pdf
    • https://arerp.kr/data/file///97931807243.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13b13f14b---52690555561.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=treatment+of+abdominal+pain+in+typhoid
    • 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_off0000d587.bin
7cd726129b33d98e6597bc09521bbbd351fdbdced169d4a3042c0683aa478b59
pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 15624 bytes
font_01_sfnt_off0000fd8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 16792 bytes
font_02_sfnt_off000115a4.bin
2e7daa5217909e6810bf8d568a3237a407ea29b09451b2a6577fbc74e52dfbec
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10812 bytes