Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecec783700ea1342…

MALICIOUS

PDF

87.3 KB Created: 2021-08-15 08:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d184353374412a0246acb96e4aef4a9 SHA-1: b198e71970abbef2446c880ef5e5b4207ab91187 SHA-256: ecec783700ea1342eed3a2a27a69757dbc66d58bb02de719e856b8e3173139d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=will+kamala+khan+be+in+the+mcu PDF link annotation
    • http://hum-lucknow.org/test/fckeditor/file/xibugejadugedine.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f131ac237ed301e0dfd7f0b60239112/wuneju.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c424ba07834411fe025bc9b3f992138a/21465168410.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/zujivurojudojejevawo.pdfIn PDF document text
    • http://hkalc.com/userfiles/gosolido.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/kuzenajopixi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f598183ed7---durunofojevofap.pdfIn PDF document text
    • https://ebooksweb.net/files/file/safaxebufakabasulegavimor.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16088bd50506c7---jaxefugadulezolopubo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1eb0bc353---47022808062.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/65903842696.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/76136925316.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edae56f690---foguvobasuzokuvuner.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbe1bbafe---90369432112.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/14742700975.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/wesonaraputupaw.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/10483380377.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2011bt2irucsqpu16fn7stpms/51759981102.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ad591052a1a8e553d4bc59ed81958fb3/wagewazukifivawaneku.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/vusiwusoradapogigimop.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2d9ebe0b---25915780857.pdfIn PDF document text
    • https://purefeeling8.com/data/file/71031374464.pdfIn PDF document text
    • 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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 17752 bytes
SHA-256: 59b1292769234c9a405e55eaad8dcb33e928166dd162b9e5b80530b288653cb3
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10432 bytes
SHA-256: 587ddead9094a18ba69028e4021e482a09d66fa32be90a38ce266d3e89bbdd2f

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