Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26e65ada19e691d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 09:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9ffdd0adb1298d256545cc8584b07c0 SHA-1: 43bdca029cbd44dbf2fdf07a94e0d5d83aa7ba4b SHA-256: d26e65ada19e691d18c722ae58411b495e21f3a6b933b860ec822c91082214c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the document. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://valsadindustries.com/userfiles/file/zatireso.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/652268ce2a72ca8948b45d4026e21214/5993740938.pdfIn PDF document text
    • https://bagstyle.uz/images/file/923891069.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/46526134086.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/30430587927.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210809_9C7D09F36F372963.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd35e85f21---bopodujokafofotovopo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6c88afe1---tugolizugivotok.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/72396957193.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1ba9547b---12163260300.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/98951377666.pdfIn PDF document text
    • http://temple.mo/userfiles/file/90650847111.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/kabolosuritedubepejuj.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/498356330.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/83052355609.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/94418492904.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/roruwibusigaxidunureb.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd842d688ba---maparimu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/u4u729citprrqp96328cc6m0q1/62584017550.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gawetomukofodidugolaxodex.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b6868a363c2a5b56d70e0158707c0598/59673013424.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/43280015687.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b858c91c0b7b6c825b7019e8809b1b31/bamazizerasiweweted.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5b786568---venugavul.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/145c349ab55506a98301964913f40301/71937005052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=guia+medico+unimed+uberlandia+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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 19248 bytes
SHA-256: 84f447dccd362195152d42d05749a9c66c558c08e8b9e8594728a5183bc36864
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 10792 bytes
SHA-256: 67b511dc60d6407d6d9dc5d2134e98eedce86092d20995ea373172c0f01da1bc
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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