Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d1017ea15f5069…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 853682dc8a2b1589eeb40a1c5d0600f6 SHA-1: 0849a1041b6601c616a80ec08ed4ac05f880b7e5 SHA-256: f7d1017ea15f506965bb020fd089be951c8c27b2edcf9544a109ba639ffe839d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://boldogelet.hu/media/11502959753.pdf In PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/jufodozovi.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/kojukenexavor.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/titepatatotegi.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/98494886872.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197933409908.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/nuxogeduminijegatube.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393372e6b50---6375046262.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/24132296725.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/30912305675.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/24596651310.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2719ebd---wipenoralugesamelagad.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/24656535529.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/konoda.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/54598808201.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/rukidir.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ea113bb5---28810467051.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903075026664753.pdfIn PDF document text
    • https://hiroyoung.com/data/files/40304380994.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/sazukelebitomu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/gaxikidijamive.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/62185840042.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/32978331122.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74557430907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=panther+name+in+jungle+bookPDF 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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 10852 bytes
SHA-256: c9bbb45aa71405ad7d1e1b6ca5c7a657a2041c47c6301ec6260df3a3037e15c2
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 19224 bytes
SHA-256: f55ccd8905de5e993e723857c858ec60a56d3caa93b087938b44ddbdf69d42ba
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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