Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f63cac226efa1d…

MALICIOUS

PDF

100.1 KB Created: 2021-07-31 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed727b074e78859848dba28cf1741331 SHA-1: ff974149a84182081d60d9556f8f4281406c1b15 SHA-256: c5f63cac226efa1d9bce2d31e83efc10a1bb5fa620277d402338163f4bd7829f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous outbound links point towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=guided+sleep+meditation+rain+honest+guys PDF link annotation
    • http://ettermanenterprises.com/ckfinder/userfiles/files/dosesedesebaxurawabalis.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/596da8f83bce0328a10c05d5708e8e3c/44448735022.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5b46034c---14958105157.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60dd90f1a---motopapeponeburoto.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/satosedigepawipi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wopife.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tevib.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/13760251141.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070038f7a764---85800152662.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/17ef9c11f590746bde283a94d892189d/2301588008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ff6cc57f---tilijilevusiguzubakubabew.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/30k59u94b8md81u545vir5l5fg/83254877241.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ca4e4182b---kejavopimosa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dchqdakuij5fd6fuot4rl43oq4/82346612434.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/80856245305.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/35692385198.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/78966925084.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lixopoguvez.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f3787037c1064e9c51ff6f155301925b/30313869475.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///23974807252.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7s5li1rljeo08h6p3gjdph3vl1/fegejojadojexazokesovepo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/77478737478.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d6qgjabfaa2edpfmjhd93q3b6q/596043471.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16572 bytes
SHA-256: d5d0d046b865280d2fdfc3297597b80888d268ab82521ac68f968a0a7b32eed5
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 17780 bytes
SHA-256: 4947051c27d07036fa6be8755b05186e5659c6d0532473470cb56086dadc180c
font_03_sfnt_off0001681a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681A 11092 bytes
SHA-256: 51006af1a0b1653d5886448c49f748839e432109bc444e41597d6df87629fe5d

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