Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d94e173bacae6d…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 14:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6293d61010f0c837686d211715b8ac06 SHA-1: 11256099dcc2a1780baffe92622c237afccf2b2d SHA-256: 53d94e173bacae6d67d5c58119383903f111f61b2a46ebbac872f12cdf284428
196 Risk Score

Malware Insights

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

This PDF document has been flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'cmd.exe' in the document text, along with the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=word+formation+list+noun+verb+adjective+adverb
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f06e91f77d---pajamevewarezoga.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608802398f513---27587388258.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f606cf0f---kosabojejitiridojemulimu.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7339316559d27e5ecfdb978550454820/4851502261.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5a593766---sedasatomomupaduvoke.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/68025278745.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/5270079755d2d60f6b46c849f1f0cd79/runijafareneroder.pdf
    • https://bikeid.net/ckfinder/userfiles/files/tadupupamomewojuxava.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/133254512.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a859203f---82073488277.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/tegekatoxaxuwividajiro.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l32cadtk7054celhpk5jhljaru/sefow.pdf
    • http://www.cavice.fi/tiedostot/files/pibekadabu.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210623_77DEF4775C0BC76D.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5qfcmd9u300vern4nb0rja5m16/sotubodagufapuk.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/80899758720.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd0c1d813c---627032311.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf7bb8d3b---94353908787.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mcca8je1lvn8k1m6de2gnktr1d/87699858275.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/354a8bc03dd39ad06ca6d1861b75c862/70262613298.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6d59f70b8369b3a77b32fc2045bae613/74286491470.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60e484f595---povomuruximotisawolomi.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/20649206192.pdf
    • http://zxsolar.com/d/files/79189122765.pdf
    • https://andrejc.si/files/file/94392970473.pdf
    • http://vytvarnyo
    • 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_off0000eef1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
font_01_sfnt_off00010708.bin
ab46e7c5514a3ddc5b8096bb0a0d161c82e1a5338b9bd0a63fe92a270f38aab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 11068 bytes
font_02_sfnt_off000120cb.bin
ba39afb9547ff884472454ad63a1d898b484d95538fe5169264c734e3c76d0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 17228 bytes

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