Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3725e1c880bd5d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 06:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3cb78062caf71f20eef2ba87928971e SHA-1: 227950e4a9c31ce9c4a8d7e5bd0f2e5a5a0d49ae SHA-256: df3725e1c880bd5d51094e259b9d8967d37c4671db5c8f0b4d7b7f14b7a6228f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://watertorens.nluserfiles/file/6081661182.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160729e2fd61c0---4950274398.pdf
    • http://teraval.cz/res/file/mezotixamibejasigupifi.pdf
    • http://garderoba.sk/images/_file/nasepobegojedi.pdf
    • http://air-ned.com/uploads/files/wamudid.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ask3juskjp10v6to9mspj0l4nq/zubazawunefafa.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607886544a442---98471932442.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210607_030330_8593.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c5ad115fd0b2b5ea13f2d49ab7f7e258/34396638773.pdf
    • http://thermogroup.ru/uploads/files/varunokegemamibimat.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f3b26910ed9b1d9901a110f768da1c06/divusekupisigukawuva.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089759f477a5---60354519972.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/aac8f2dfaadd1b5e9aeffb59f8a36966/4148124178.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab83c2da8---73259745672.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5313d0908---25364345782.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a5edfa51---pezenipujulegoxupaxovowi.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0103973f---mibovogigusirug.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedbc36febd---8584743094.pdf
    • http://lycee-elm.org/userfiles/file/metokemunudimiwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bruins+trivia+questions+and+answers
    • 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_off0000edd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 16792 bytes
font_01_sfnt_off000105e9.bin
016eeaee7a54950c02882beac34ea5a84ce4b4f20ffb47f8dad2da7cdea3b7c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 17740 bytes
font_02_sfnt_off00013442.bin
6f3088ed996c027982fe9df41945322e3b9b7ed550334df4593cda0a2fdf374d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 10648 bytes