Malicious PDF — malware analysis report

Static analysis result for SHA-256 4762c26891cfa9b1…

MALICIOUS

PDF

104.8 KB Created: 2021-07-24 06:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8ecdff788ff77fa424942e1eca9bc4c5 SHA-1: 45d2ae50f7eab783a74c368ac68c72a9c25735ef SHA-256: 4762c26891cfa9b14cd4f0b497ba37c58561ea4e69f467fec8352f9be038f76c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f646e3d48b---jexubizokitagura.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf4c048d2---bubobidevejevorajaroxupu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/27977128111.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/81652345471.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20df66d03---batobeja.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/78af3e5966fac99e55bfe2e5f353926b/61004966970.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/1984658593.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d0a8d435c0bba9d2ace7d448fb30ee57/67125314381.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/biwowawojutatumigizizuvav.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bhhbh8f4vndkr5td1eocdo710i/damix.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sou7ao9e09vkh6dhhrdnenvfkh/xejerof.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851adb7236---65448179380.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/situzinulixowefigo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//58430931811.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/7337373522.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986ecb7525---93096513893.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/37b7230a02718384b38275a7fd3381cd/vobomuxiguvebajapi.pdfIn PDF document text
    • http://funperm.ru/content/file/33653578663.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tamoboseveminuwumefupufax.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b1763760a247539f97648db8bb089db/70113634937.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f978a651---wejenibinolosavugibeva.pdfIn PDF document text
    • http://nfc.soo.jp/file/pozosipeb.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7477940ef41ff16f6363866d13b8d5b9/76941718467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=haye+ni+nakhra+tera+ni+mp3+download+songs.pkPDF 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_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE7 17548 bytes
SHA-256: ffba272aed92a338909c5ca7abcc6f4fc70c69bd6a7cdd8924770c83f3629a98
font_02_sfnt_off00017916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17916 11360 bytes
SHA-256: 866e1fb92a9e107ad41e2b1077381b04e130e41f4a2e472c69816c9cffa7e68d

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