Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf5d865744d45b3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 23:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3e46e099e12e794bf1c83d0db22bf0a SHA-1: d08fb6a29c4a49e7c7cc22657ae3bacfaadae118 SHA-256: fbf5d865744d45b3d3ba889e3ceca6297aac651b4f0afd91880754da98bd6214
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the presence of a link farm pointing to numerous PDFs hosted on compromised CMS uploads suggest an attempt to distribute further malicious content or phishing lures. The primary attack vector appears to be a malicious attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/pobipomuxa.pdf In PDF document text
    • http://lejuriste.ru/files/file/pigegukonimaxujogupog.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/8320283190.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/fapesifulupugaziv.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g9vo46hpqp6jl5d6ufbg9ncn52/tororifel.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc3304389---wuxiweregi.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/94557531335.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/aoafn3vthkr541g0g5gt3as2dv/rapaso.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/sigajifuloveketafadul.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3081aff7100cecce607197b405e61bb4/fezebupufixedir.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4012853059.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/20489603126.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2e73f4e2---37676745272.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/75m7996b7vsbkjhss6gt2jf7o7/34428884715.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fe92f010bdb---95115867028.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/68332427167.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/68176852177.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acbb7e3c7---89617948303.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/21392370989.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e35f414ad---zemoriximipuzurixafi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/34045630139.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/midefebug.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/61218865510.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/83472267466.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/14fe24c69dadf29974dea016cf3a5703/70970366590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=small+coffee+shop+business+plan+pdfPDF 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 11004 bytes
SHA-256: 8ccc889d4a9ad496828084491912c9e4ec2420c5a8034394dd38311d220d954d
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 16824 bytes
SHA-256: ff5a83b9171ccbfb0351c910d11ac1d8bd84ddd5dda7021efb09f6344f9c03c2
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1