Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d449d9903cba50e…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 08:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77bd91c40f1b6d16104efb3850bf3e89 SHA-1: 53a5c10e492223b767f6930b537aef732872feaa SHA-256: 2d449d9903cba50ef67a89656db29fb8d8eb4c3068efe872ff5c50885cd0498b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=quiz+questions+and+answers+on+history+of+india
    • http://dnepropress.net/files/file/dixavijijobitonapubif.pdf
    • https://vibangnhadat.com/uploads/files/vunesotafatisumorasubusuz.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmshba89rmkh074iafkrrv5icm/lugixolinane.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/994b0f68de4666caca413764b25df2df/63222400999.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070308b9df86---vovubatukuzabitetil.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ati1bgnn94q64s5hq9uigvtlmp/punokexo.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a23006412---67937993336.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a880939d76---48461523039.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f16e5c736---98872034153.pdf
    • http://pwr-tech.ru/userfiles/file/64591627882.pdf
    • http://thesetnews.com/images/fckeditor/file/21653488201.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/13850615000.pdf
    • http://chixue.com/uploadfile/file/20210615234345.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647a611a7d---19293950354.pdf
    • http://teechart.com/uploads/images/files/jirasipogitakuz.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a437b46a---dejakamumazegixej.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2074b56d5b---33544265124.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ddb0eff4---mujisomuxulubu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdff4937e---moponakijeweverizora.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a72f27bc---lotutarisetufilo.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/82140263f2ae8b5a9efac425fb10ff60/bepanebobak.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52bd1c3cd2---81513154795.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_off0000fc27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 16792 bytes
font_01_sfnt_off00011439.bin
6950bdeb3bf9b37bff9a78dadaf7003cfdd6b2b12124236520b688611e0c36e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 17448 bytes
font_02_sfnt_off00014217.bin
ada5af2c5c3235ef213dad766d7f75f8df2024f99d91d7f920401fbddc7730b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 10968 bytes