Malicious PDF — malware analysis report

Static analysis result for SHA-256 5415b56fae891964…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 23:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a21e2262b818b9278ef660ef5d80aa6 SHA-1: a19e3bd9b03e8a9e5c34c00b7073cd0b90a4860b SHA-256: 5415b56fae89196472b9cca8ac9d45d2a1c98dfa5b7c7af79b26d02088bec2a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of 'cmd/56405122035.pdf' in the document text, coupled with the PDF_SEO_DISPOSABLE_LINK_FARM and SE_LOLBIN_RUN_COMMAND heuristics, points towards an attempt to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall structure and heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6k7sjpd7b7tl40rub0h4ngocmd/56405122035.pdf
    • https://majubesar.info/contents//files/71328234111.pdf
    • http://biafrapol.pl/pliki/file/folalanazixotobov.pdf
    • http://dzbnf.com/upload/file///91452060490.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1bf707e363c6c9c60c0f534840145c88/42828054300.pdf
    • http://radissonhoteltraining.com/userfiles/file/43447548671.pdf
    • https://shipnhanh247.vn/asset/files/39552283233.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7s6i1lc8lficpss7dpvag3ns54/dozuzanosijenabiter.pdf
    • http://www.fuchingrading.com/upload/file/nilelexenusujenetobeze.pdf
    • http://ranch.pl/files/file/89478044458.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3757192190.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/64cdac6b923a6cf43a37a3841dd59457/mezujikirajufivaxu.pdf
    • http://kayapaliinsaat.net/file/23129206127.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9917d747---45589328273.pdf
    • http://architettoseneca.com/userfiles/files/ridugota.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5615deb76---21561250223.pdf
    • http://anatolianlgs.com/userfiles/file/94125585407.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2ca5ea51ff810c96a3bd2699e82ab8cf/53720905255.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7eaadf0e5abbfa8bc0e3dc0463e9801f/xolunigolugiwujo.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/nerewefejizizikibif.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608127d2ec909---95050888140.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bi4mfdkmsfppbn0aoi2h5u8c83/10563637709.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/53906066282.pdf
    • http://vetcarefoundation.org/userfiles/file/27656677830.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/jowudotazemivipupus.pdf
    • https://sistemagestiondpr.com/userfiles/file/mebawurikomiwe.pdf
    • https://coffeetuanvang.com/Images_upload/files/xugosivukek.pdf
    • https://majubesar.info/contents//files/7
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ecclesiastical+law+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
font_01_sfnt_off0000f76e.bin
eed0915f997771b82a52e1c2478750d5eee82a3325fd72a240e1d643f0062abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 18268 bytes
font_02_sfnt_off000126ca.bin
79dc03f45ecee5c9cef5bb35865eed7495dbafd1180628e3fdab2a29fb528ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 10360 bytes

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