Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ca5cba3506ea4b…

MALICIOUS

PDF

93.2 KB Created: 2021-07-17 10:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1372a02304dad5aa91fe88b8de88512 SHA-1: 1a1a1c8a91b391ea5243c105a919cec78e214d6b SHA-256: b4ca5cba3506ea4bf4ba593866e461f411ea4d661c3a1dae4fedba3c1654937e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a tactic to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://hostingyuvasi.com/calisma2/files/uploads/25989858031.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3qu8sfbrjro4cbr719rtr4kqtl/fumezebalud.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/jatozizafotovipewuwodoz.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/sojonirogarojamibojunotep.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/wutijunuxu.pdfIn PDF document text
    • https://isosklo.cz/uploads/xukowusokiwafawiro.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edee0a9d307---22129381836.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/gikokusirewun.pdfIn PDF document text
    • https://vestol.bg/files/file/26931997737.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pevuwediwudinuberamasepe.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/08faa2f6d533547a660f9ff593b47221/vusalipunolapidubigapod.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/lakovawewanotefukin.pdfIn PDF document text
    • https://yuss.it/file/61914749095.pdfIn PDF document text
    • http://jngf.cn/files/file/ziluwu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/72843da8a555ffdbda466c34b23dfe1e/woxuderisiwija.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ce71aab73ea---99483363935.pdfIn PDF document text
    • https://appfacile.it/file/vexabitizajogup.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27fdec6b57---55517132667.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40cb205a5---96407986349.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2160ba34cc8774906ffdfc2ec04b4662/49666989678.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/87f1fcd60205be6ad0e01bcc2301018b/zusurigega.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/777804dd735b66fb12c20a5c5b789392/lezozo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1d619e0c8c3be0253e7443f8d9adc3b2/dodomuduzugoran.pdfIn PDF document text
    • http://abnicum.com/files/file/17398369669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=game+of+sultans+tips+and+tricksPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 17084 bytes
SHA-256: 4c693537bbc53d9cae01c735f7073171787da2726c68823242b67647dabb3e30
font_02_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 11012 bytes
SHA-256: 6613c0e9956f150c99cc49a5ec541a59029197251689fdc71553da6b74d44d92
font_03_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489

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