Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8c6c3d81f4fcf…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 13:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 145a0c087b154b3effe6d3a36a8d052a SHA-1: 8cd017bd2041c310b693836b77d78dda6622bec4 SHA-256: 38c8c6c3d81f4fcfbd67afd9c88936d4d477142a2ab8c267bf74f3e9979e328d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to disposable hosting and compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure to initiate a phone-based social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=secured+pdf+to+unsecured+pdf PDF link annotation
    • http://beijingxinzhi.com/userfiles/file/20210911041658_1934049177.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2c4kpd24vtdbon0gq9a49n8924/vorogimorutigekepigop.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/93067674913.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040359451365.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/71199734920.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/luvaripababowojodezati.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170e297432---xavexefijox.pdfIn PDF document text
    • http://sql110.com/pic/zutikonaki.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/febajojajun.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c04b7251---92963568982.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wematetuvoxoniwirog.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/36709855009.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/dexijifofalet.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/59530271974.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/31970895899.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/44667867485.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///sugixobavevulowoj.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/ramus.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/77960409900.pdfIn PDF document text
    • https://iwistw.com/upload/files/61984560218.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/ponizulede.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/nolebudabajabeni.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vidimezo.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/80728270182.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6dfbabcff2613e605ace97987f4485d5/luxavekejalumalelamodilap.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/40989916801.pdfIn PDF document text
    • 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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 17964 bytes
SHA-256: c5a0e657a520c1d36399c2f53714c5829354afffdd469bc323e8fa12f7c5dc56
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10488 bytes
SHA-256: 92cfa6fdff916ce9c8c71d84c7b1b916ed944ae39479f064596b9aeb3b183fd5

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