Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b545400a4cca26a…

MALICIOUS

PDF

100.6 KB Created: 2021-09-19 06:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5adb4edd5b9bd7c332140d18dfcb446 SHA-1: b9cecafab58c5a6c17257275287b6d7f3eb7fae3 SHA-256: 7b545400a4cca26a47d4658286246174dd8419f0db3068a90c340cc0c3fbc375
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://chcial.ru/uplcv?utm_term=instagram+voice+message+download+android PDF link annotation
    • http://zhongguohuachun.com/d/files/zesuxi.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fd9b46f21d.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/gulajales.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613731bcad381---noviwu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/60827791689.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/a3qtohekkorglg72e82pqthjc9/56433772273.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/fidopomaritagop.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/79220388515.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ce362eb9---kopob.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/58198365983.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/jimemegizubepofe.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69573663973.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/ruxavaga.pdfIn PDF document text
    • https://ambalatender.com/upload/files/96124683754.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/49966305653.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sorizetes.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/37545834987.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929dca7bbd---10999162037.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109171812477216.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30568259593.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362bfe1e86b---wujajodamoxemakof.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/2276008891.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/88598160053.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/50f137906926d35b13d727ad8a013655/38672232303.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/88102117143.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/sudira.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_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10816 bytes
SHA-256: 016d24f50b396c83f8282ed573b632b27f3cd8e2cdc9dc34b5f74bbba683a133
font_01_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3B 20940 bytes
SHA-256: fe1ac2aa2a7387582097ce816865dd5a6317906e806e7a147600dcfb84522a63

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