Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e137bf8927448d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 20:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47c2f032371f7933c59f39c1af6b73cf SHA-1: 42cd6ff58bc9067f0dff0d155addfd7ffd9d6e23 SHA-256: 39e137bf8927448d5975185f7d429e33d61a443d12351f6455c4e06e7167f5ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised websites, likely serving as a lure for phishing or further malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goodmix-psc.com/userfiles/files/80898358774.pdf
    • http://studiodugnani.it/userfiles/files/3761185706.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a175f1491---64264239183.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa001d787---ganajagunetapulad.pdf
    • http://1utilaje.ro/mm/file/80356543005.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b98deb34---wezoleju.pdf
    • http://dynamic1984.com/user_file/file/41640138704.pdf
    • http://cheapmarkt.com/userfiles/file/pegip.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbb02c96f---wivexavefodevugakomuv.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/texirobokujikafutibopad.pdf
    • http://deltastal.ru/userfiles/file/92654491994.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607187ae9e569---77029410764.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/28993131720.pdf
    • https://esz.jp/img/editor/files/patoxewawik.pdf
    • http://szpk.hu/_user/file/vabavopetakes.pdf
    • https://suksesunited.com/contents//files/62793631767.pdf
    • https://vannordenvastgoed.nl/userfiles/file/98268621299.pdf
    • http://www.pranabkumar.com/fckimages/file/47423948863.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3a37ddd16680abe0f6c31f00984223df/vopelamidawewegitopu.pdf
    • http://erbaytag.com/resimler/files/solodi.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/tutaxusom.pdf
    • https://ocw.tw/uploads/files/bipenenuradonerenik.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/81117844325.pdf
    • https://shipnhanh247.vn/asset/files/ruduzinejokemanules.pdf
    • http://dtmaso.com/public_html/Imagens/file/14537521822.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+pdf+text+editor+no+watermark
    • 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_off0000dac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 16792 bytes
font_01_sfnt_off0000f2d7.bin
304438d194bbb34eec25d9ec8530400292e280fdefaebf0335a65f0b3e12d785
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17112 bytes
font_02_sfnt_off00011ee7.bin
458e954e164cee99021af7c306e1f52a5bc18afdc7c5f9fc80d010a7460cdb92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 10700 bytes