Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac9492728275d52…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 15:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4683e627f6ba9be66c3cd5827007ff8a SHA-1: 892711f00ab6fff66d4113c136cb58973b7a26ff SHA-256: 3ac9492728275d523bcb1591e85bd25a679f97e4162ec749d75f71963aadcb15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ketchas.ru/uplcv?utm_term=90+day+fiance+single+life+watch+online+free PDF link annotation
    • http://shqinze.net/admin/upimg/file///55604214003.pdfIn PDF document text
    • https://tierlistei.ch/downloads/morerevin.pdfIn PDF document text
    • https://ssangyong.adasenotomotiv.com/userfiles/file/lesomowofume.pdfIn PDF document text
    • http://deltools.com/userfiles/file/72723881564.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sobivum.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fafovexajemaben.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-6/20210906133237169697.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/42820850717.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080049326949.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/381338eb6f0cf0884f66fe6acfe1858a/95428222570.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/75975654807.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/wanepupof.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd9e3d280e---5613027536.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/96527107267.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920140718929686.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409f638b079---54918876154.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2cbf6f489---97386000417.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/19022743268.pdfIn PDF document text
    • https://tigaintan.com/contents/files/54270454979.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/jamitodabi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3632ac0e21f560a3b21ba4ff30e79202/23800806817.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/xoditogigidupesikiger.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613743f2ab55e---futubuvijiruvasoji.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/65954531749.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614746efdee32---30351296256.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/50813092613.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 11148 bytes
SHA-256: 6f3cb9a4419589846761178ff31f7376ff8030c1a6970518f09aaaa2d11ca798
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 16128 bytes
SHA-256: 3860e594d0d809fa283caa84f1ea0395e5a899f94bf77e3449dec12a5ab0944f

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