Malicious PDF — malware analysis report

Static analysis result for SHA-256 f970680c24bf17a2…

MALICIOUS

PDF

73.7 KB Created: 2021-06-28 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de309875a82d06846b4a7eb53ddda016 SHA-1: 28591a120161897b8adb8f147481601d77c6696e SHA-256: f970680c24bf17a2f6373255ad4a453fe627d3e62316d17356e622046bde7acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=what+is+a+small+car
    • https://hinodanang.com/uploads/image/files/67381171918.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6559a762f4380c06a9f9db4115a77509/lofudovawekodatu.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210616_38D4BB4306CBE368.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924c4939d8---vijopomereren.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7374b166c22691381a93dd2a39a3e10a/98244106235.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c7908bf7e2de9ccda15d6c384c5bbf52/37849577285.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ebf98dc9f94b560c77d6f5d76f24194/66866730628.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a0114371---rewamuloxidewevojob.pdf
    • http://chromoink.com/updates/file/sivafulipatapen.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/vcfmupamebt6fjmmh8vt6pge56/wamaxitoxo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f7b02274109acccdcc411854f0dffe13/luzajeririnolutugogozobej.pdf
    • http://geredekombiservisi.com/userfiles/file/fusasedawukawobis.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3b51ba9a---11696223795.pdf
    • http://www.abcklima.hu//data/editorfile/wimigetovowab.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fd36c244---dujezelanasefaxe.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c5a52e8e---4339470011.pdf
    • http://applexin.com/ttpsea/files/file/2079199526.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/ganedi.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082239bddd18---21651457754.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/39734657885.pdf
    • http://ahcxdq.com/uploads/file/152109479265.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/85da1cdc6ada673c3c23c0ddd12ce267/pevinuwowibinafizanuxel.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_off0000c11b.bin
0f7a8c4cfd87f884af0fbf527e74680aea5e6b240a1a3c85a58a2cb5aedb8b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11B 10132 bytes
font_01_sfnt_off0000d7b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
font_02_sfnt_off0000efc7.bin
78ccbeb0562c48ee2378db1618223bf0e12cc62405d37b4dc6376e054a6aba2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 15664 bytes