Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e864799e740025…

MALICIOUS

PDF

94.4 KB Created: 2021-09-17 04:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaf8a5a614a96475a64816dc3ac729cb SHA-1: be4ff34b0a9a67f2c50539f28b42bbcc49d4b623 SHA-256: 34e864799e740025babdd7f027e1cf538462319c87ca873176018d02037153fa
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of 'cmd.com/data/files/' in the document text indicates an attempt to execute commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/50404371559.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5f398ce4---22430470383.pdf
    • http://gibkrakow.pl/uploads/files/16857479079.pdf
    • http://animationcoach.com/userfiles/file/9339294264.pdf
    • https://stpm-sa.com/userfiles/file/97444483106.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/mipusokaridogunepajabeg.pdf
    • https://eurochen.com/UpFiles/WebEditorFiles/file/lamenov.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/tixolejakodedasamabuwiwid.pdf
    • https://mobilaide.com/upload/editor/file/sisuwukofuzabefarixak.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/sexatinirotelisewobuberel.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140221167ce4---mafexegowipumutino.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc227e86230115d67665a444c44c34f2/71091706581.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vavepusonewipikejarawovep.pdf
    • http://www.allatpatikapecs.hu/images/file/soxerekewifopumepabosuf.pdf
    • http://palestraarkadia.it/userfiles/files/wadixakefo.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/53519850413.pdf
    • http://sgd42.ru/userfiles/file/matalurijonuparakiwipora.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/bitoruzolor.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdf
    • http://qdcmd.com/data/files/64906123536.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a525d717d---44906484461.pdf
    • http://xhiehchin.com/Xhieh_News/_file/20280579104.pdf
    • http://artgraf24.pl/userfiles/file/lilazofodanegizimeluwoli.pdf
    • http://bilateralmatters.org/userfiles/file/gonud.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f152f9e8f4---nibolexemuleditizikoga.pdf
    • http://baigeleather.com/userfiles/file/guzafumawimaw.pdf
    • http://raduzhniy.com/wp-c
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=einstein+phd+thesis+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_off0001041e.bin
f09a7310f3a667043e390ea474bcc1557632dfc2206df404ff9324286c240a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 22004 bytes
font_01_sfnt_off00013cf2.bin
0a522f0e585a00aab50804994a89acf826d44929818d867f777d736876d2f809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 10152 bytes
font_02_sfnt_off00015381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15381 16792 bytes

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