Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fe1c1c6e637940…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 09:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2df23d5b306b9184eb93bb919c08bd38 SHA-1: bbb33b37c7aa511738119113136f8ac76a76512c SHA-256: 15fe1c1c6e6379408194d34b841463e82367778141c078bb74d356d07dff30fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://sanfrancescovet.com/userfiles/files/12026299648.pdf In PDF document text
    • http://www.petercar0937494634.com/upload/img/files/siwamevuxomole.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/41498866067.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/6672905390.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f466344c74---27720855027.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/80997842125.pdfIn PDF document text
    • http://labradory.pl/file/felezegenozumadogan.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ef5j7l76di0rh6esl30vtgg5fb/17111757187.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210916081705.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139297c2e4---28020542010.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613504b90f0a6---54508964154.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/takafipafopojaf.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109051734267439.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3724a16b---lasobivinos.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/37671373807.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/77507798504.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130296791728---5612524999.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/40179488585.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091607374273499.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/91008743811.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/21643455022.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/22713867542.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/ronamozosabaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=man+of+the+house+full+moviePDF 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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 17676 bytes
SHA-256: 86f0b97481d4ab5e12c90444e7707222b3ee0528b25879b7410639e2c96c98fa
font_01_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 10540 bytes
SHA-256: dfcbd8611112e6ab3d5a92e073bc4dcd3f6a871809d8cf6b61208aa071445da0
font_02_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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