Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e966f472ae6110…

MALICIOUS

PDF

119.6 KB Created: 2021-07-02 21:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab237f31dc24fe2dac7a0838b538dedf SHA-1: 3db72178ebd389df120830f147cb7b854fad4503 SHA-256: c1e966f472ae6110ec01364e574fb901f69a3f294af14e45cefda5ad63c44b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0ea9ba6d---nitowobizizozopam.pdf In PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/muerep3h6hb346es09g5vc8vh0/14385007304.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/dajeki.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/lawuzinebakudo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbee27bbe4---wubefupapoxas.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72ffdad44e---nitejavez.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210624_50C3E9EB2DF49CE9.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160751ff32fef9---16290506208.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b773a627494---64854822059.pdfIn PDF document text
    • https://digireg.dk/upload/72118491218.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373345b9f---dilevujol.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b388616e---vesorodixomukelinuz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512c73ec6f---kobexare.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/fovesavuleda.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ace9d5f6---lojikopuzed.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kltfj5fv19me9j44qocupk3qth/bilusufexuka.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f03e567c---jibakipotalopetowuv.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nimobifavu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/87073932950.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/92bmrhojlj5cb400jjprq92ed2/90488380235.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9e68d1f608d65fe559b46980ff401864/65211437331.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/sukelopebi.pdfIn PDF document text
    • http://0930actress.com/files/files/jebomaxesofekebedit.pdfIn PDF document text
    • https://ubranni.com/uploader/files/18670276317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=formative+and+summative+assessment+definitionPDF 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_off00017178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17178 17852 bytes
SHA-256: 70313f3487f11b445b3fa2e8e150b5d2bdffb4a595caec90936aa2d4d4fb88bf
font_01_sfnt_off0001a054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86B 10612 bytes
SHA-256: 829e319de65563f0dd28eaf2a45e2332f896938243667442a50f2d489378c688