Malicious PDF — malware analysis report

Static analysis result for SHA-256 374c82f202651eb8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 16:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da50ee91f8a5c85dac75f3fc3764cdbb SHA-1: 64516736ebb64442f019ed19c4bd13140ae0f824 SHA-256: 374c82f202651eb8b0a85ef07e56891fd8a7b1422b085ce01f4cb87d2359b795
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to phishing pages or malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fe5movk7adl7hdop0pqseim7o1/27018803823.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79de954801---46075959180.pdf
    • http://apexibd.com/uploads/fck_uploads/file/9998233678.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ivfas8uf365aq8jvht80n5o2u1/88128638441.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0294a223---84052042701.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f1a1445eef276bbdde177f629e261c0a/73743002067.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a915cee37f4---78658157127.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa71debf2---tatarege.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef00eef4d0---17453234106.pdf
    • https://alpinashop.bg/files/92155365786.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c071122935---73398902963.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7q803frbppofc0t414htp0jus8/61831715771.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/apgn32trhtalskoeg7uemqs2ce/xuxudaxarebezedakepeko.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7a6894a22ffe9180a8a082e0c9e4796e/6585084484.pdf
    • http://ural-resyrs.ru/data/file/mutidusonijawidelutawe.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0261416---53397339232.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/514300887.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed54aa0c3d---56905197156.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cc6144dd---piwudun.pdf
    • http://carszana.com/image/upload/File/93209880999.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8lhh1k0al56ivisk51htdfh9sf/kesutikut.pdf
    • https://kompaspt1.com/contents//files/xebama.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42c03b10f---25430490498.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tracing+activity+for+toddlers+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_off0000f285.bin
294b200c31b2c43604f17bbbefdcad007a880c37cefd607a20825c51612ebfd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10936 bytes
font_01_sfnt_off00010bd1.bin
e01e421ce633f7916c9686dc9665c3e42df8cf1c9f8a0fd21073463d3e161e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16528 bytes
font_02_sfnt_off000136b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes