Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ec1c870ebf4b66…

MALICIOUS

PDF

77.4 KB Created: 2021-07-21 12:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dc540423ec3f96b0928abce1a750cb3 SHA-1: 0beb0b0059fcf29b49ad3061f2e33af3e4c66e06 SHA-256: c2ec1c870ebf4b66d6b9c7536c691991d47404e6320602b1d3835b91e36a4728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to other PDF files hosted on compromised WordPress sites. These URLs form a link farm, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tese.in/ckfinder/userfiles/files/jagibotuserafanijurafivum.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58bb16b8b---53499340667.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/35210710908.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/nixavijojopevasutif.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8cc0d90e0---lofomodewosutonobofutega.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i4pt4b7pk2oi20o2brjkndfulj/lazolapowisiwobedaso.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc21c9933f---58011810067.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/pugukutijerelepefituf.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28fd1e8f9---biduzogujesilo.pdfIn PDF document text
    • http://tfforming.ru/d/files/83773751311.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b231e8498b2---79834196678.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/16b1fb666b4fe08ca10118f3a5a7d034/sesukubejepijubudog.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062001434_810475430.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kamiguta.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/jonasidigozujafegasaj.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/kivulikemelejusokapuwa.pdfIn PDF document text
    • https://brod-plovdiv.com/images/77910780934.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/bomokivuputavezovos.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66065a118---dokuwiviwavupefife.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/tajifojozukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adverb+exercise+for+class+4PDF 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_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 10632 bytes
SHA-256: 8ac4e7fd6cb0a1ea0264069775459995194f8659e84f41610b60d41dbd80a512
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 17040 bytes
SHA-256: 0700adbaad2d6ba530aaa2a771f1578c9473b3f46216a13249a35da012b2d609

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