Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8e149808f2c152…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 07:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: d13dc546121fc1a9923aab1da6904b93 SHA-1: ebf22ad40a44521c35ddd5e6592d2682dc22f250 SHA-256: 6c8e149808f2c15201cc5c1c4a8f819e3d4e43d5a4019ce78e9f58d5c6244958
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristic firings clearly point to a malicious link redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://banderlogclub.ru/Files/file/76494177425.pdf In PDF document text
    • http://pampa.be/uploads/userfiles/files/30038484448.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddd268e687---jokuzakezaragoz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjicgvionpo4dkanssd9ddegu5/tukijenokesokudanarawoj.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/89356181173.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/23/vatuketozidubovovezuwuwan.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/92fiq36jq7cq66jc0871cljkk4/jebevil.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/5467441257.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/rabelemadimosovevemolaf.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4470aa32bfacceded5ebe4184841e4f8/vabuwarawu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2uejph46gck156b6p0sto0vlp3/pukasuwijuti.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607564e7d2532---bapewogixig.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/98df9eaae225ed72def0dd12121a2e24/rawebut.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/soleninavomevizewe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2b392769---83378129777.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/02ed79b4d7acf2e27a0622e9cdf1711e/71978308183.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a3a3dcc0---14687459774.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/23167173414.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/tejinikoparujijofo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/toburibin.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/lorasibuxavokejazof.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/munered.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xaravegugokip.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/73553616959.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gdve4c3o22fidhasomm75ddek2/zomagebogamurenotuledod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=termination+letter+to+employee+for+misbehaviourPDF 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_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 11008 bytes
SHA-256: ae9de13cc0e70c4ac350a5ac17c50973a153217bfb1f3a6539095a331a52d68b
font_01_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16528 bytes
SHA-256: c6d84ecfbea39eb06d131a93826ff324ae93bbe3335f162b2226b9a9d77f7439
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1