Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f372d7923242133…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 20:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a6314a76a439af7ea55f8b6aa95c33a SHA-1: 4daa07ff42fbca138de1e63c0f3d38505e581860 SHA-256: 3f372d7923242133eb2eb85747f67427e539fd8d1cae5ca8c67a4b7b5518755d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm hosted on multiple distinct, potentially disposable domains, suggesting a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/76cu8cksai5e3r0147a6qfqe2t/pawapikoditupobo.pdf In PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/zalufosalituxufabaxakar.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f4cc9f2f7e2c7650defe3ccee62e3d5d/88778556297.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/904b849bfc18995c38e27c4ba2bf5add/11302859441.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7540af69---vupito.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7dbe625f6fd07f3729b2d67b3f208c35/40881612569.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/aed9dc309496360c89bf84cdc6e20333/kenezebob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1826d0ec---jenasopo.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/fegolulizebu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/50510861243.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7a95464e4260859956e3ec13463adef3/55272585721.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/2fuic3t0mcev4rgpr9oofvm8ah/luxamijujizejuwa.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/wufekabuwi.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/65611002141.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb417d76ec0---69883086932.pdfIn PDF document text
    • http://yoron.net/up/files/menowojusedezupigik.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210714_853E1B11785AB38B.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609916c8299df---31613765615.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qgchh61emv4h0kp28br67g8kt7/79496879537.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/jozumusiwejijesomunez.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/toluzapofovodiluwotad.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/70ao1fnhr9cskbfk614f7pts65/birotaburigizodaz.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/vefigofab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=all+airport+codes+in+the+world+pdfPDF 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10784 bytes
SHA-256: ce8bb32cc6efaaf86f8cd3023078e68c18f77d268817104af481b9a421177388
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 18032 bytes
SHA-256: b22324c0ee0dd203ad0081cc0400e0ffb653ad488d7212c8736aeca137c04ba9

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