Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24e1043d1a8027f…

MALICIOUS

PDF

113.3 KB Created: 2021-08-19 02:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a5347ce7e64e123e838ebb92517cc37 SHA-1: c528867839ff3822e7fde439fd7254089f364490 SHA-256: f24e1043d1a8027f1c268d06ea8409dcc10dc2fd42e6afb432dfc3f1c28ef77a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://mictrogiang.com/userfiles/files/62825753465.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rbmn31o209khe9sapdqjovdamc/vutuzizosajavo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32e6bpmb4ku8bvmpcmud6vdjm3/zogijisaxet.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8826d3ce05a90dedc0691d23e102b39c/zolemowoxo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f31b6f9d7ce---89081318565.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5be0b8173b7e77d6ff4882e35ea68da4/22364824761.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d5d3pt6bmo7gebp3aov5j8e4t3/44690195309.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8355277a---kubijidaxujunodejeji.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/14390360613.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/20dc20285375b36c776701d5cfc73f66/75553517880.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/95622437530.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1192b6d41a---xuwuzagel.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/juzurivopazun.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2996ada7d---gapajojukakutibuvasuvi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/72162261053.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o5fdh6n3gusqtk6jt6ag1n09mu/bukipogevuxevisibaxidol.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/17fbfc02484fd749bf176747edd29d15/pusuj.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/11089082481.pdfIn PDF document text
    • https://5udua.com/contents//files/bofujavisakakapulabenoka.pdfIn PDF document text
    • https://argumentua.com/i/file/kivesirelilip.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/98721051346.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/jilefizar.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611912d168b58---woluxovamusuzuxojiwo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1e6dccf4c---83198940972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+play+call+of+duty+4+multiplayer+offline+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 10984 bytes
SHA-256: 3cffae138cbc6de51ac88c34beecb7ac7ef72affe650e3d352d8b4b2b65794fc
font_01_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 17664 bytes
SHA-256: d6faeb12ba7a1b8577dc685ac2b1439e51d87d0dad2c7bbe34083a6a85031ba3
font_02_sfnt_off00019e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1