Malicious PDF — malware analysis report

Static analysis result for SHA-256 4901b4f728b85c70…

MALICIOUS

PDF

72.5 KB Created: 2021-06-26 06:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1069461d9652ce8312ab5be4b9027fd1 SHA-1: e97d3d6eb97b17ec9853694fd1b170943e837837 SHA-256: 4901b4f728b85c70703e16975e2a6df953874e078f2bdcc92cec78de6d468ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://archism.ru/uplcv?utm_term=zepter+cleansy+manual PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/97b3682de4c4e98c5d761d20d02c56d3/piropoluxituvowukuv.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/kcca9ovu575qpdlsl9c370fmkl/nidelaj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mgtknaiefsu486vv0q1rkcnfl5/67173628482.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/xamaduzegowoziraw.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/josajorajabuxakapiberukaj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/dfd37611c3da447338e931b60872f493/50520219806.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c454da97a31b7f157827a777fa42b77/korolapaxofidag.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/jujimadewofepudafo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c51238cb---55086573705.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/4227978408.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/42061980015.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/wevininamokamifirolo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/rotogn8c7gt861m74qf7j8u992/12263233566.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae661vh1jvk69vq64jhu6rm851/weruwez.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5a892839---tipox.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0d4440f5---22400191650.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/laxaxilej.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/66644028278.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083bef3529f5---jolerimijapavirub.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/59b5f889d0bd3c584e8520d03f088121/40376545423.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/60126672143.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3dcaa2a25af9c115d20d16ad8ab20efb/12996365796.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/26690379822.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/lilipetadagoxizilajazisop.pdfIn PDF document text
    • http://sushi-belovo.ru/files/jisejonitebizuxipesinufo.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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 10500 bytes
SHA-256: 040ac7bda5b5b2dfe1f34b2c93824e3941c10c86189d81c86e6c7ffec33ed676
font_01_sfnt_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 16208 bytes
SHA-256: 7d69d9dec7a6732bd1aa4126256f3471b8d25d4712d34bf50f87486e4ff0a645
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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