Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff63571607b58ae…

MALICIOUS

PDF

108.4 KB Created: 2021-07-08 08:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6c6c2a85672e18dad461281e5047d4e SHA-1: efb0475be7f7ee7db782c4057b971e06f8ac5456 SHA-256: 4ff63571607b58ae69a3412afb1a3ccb37ffc39d5d274665089e4363771b0362
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9f8908c8e7dd536af21d1958042227f9/45592005190.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91b8da6c2---60080933243.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2m2kbapupa5qbuevv92do1d710/14704888845.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mijanureke.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/6999314738.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f107fe4b0b---91956079493.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a22e99677---97247802595.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3up3k8riu9nirl1qapktdmm635/dajafuno.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/verosapavapa.pdfIn PDF document text
    • http://abnicum.com/files/file/49789055510.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607358f5419f2---65308725143.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nonijesinelegarulis.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jli2s7d06aeovjk5rhal2h6gc0/48342144640.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa2f97f41---81988685158.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vafezarexopebifapati.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a026d60a078d8c076e085710e1bee1ea/92620849441.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f62d996133d99b25cc3d324436a34b15/zujuki.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607154e2ee771---gusiribuwukorerowa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140d7802cf---37472031757.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4uf3l5brqfn6pdto910g3hd1e0/46660756477.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7kgk82k5rp0sv0gmhpk7sthodt/tikuzejipalaboluwe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa652dd96---90548439034.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/niririjamori.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f5987c1f0a2c9eec7ac70204da4b433b/tebetivasijitejavat.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c13837f33---dokutakaxawogit.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f09aed7---nitabitajasetuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=punt+betting+meaningPDF 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_off000146e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E3 17516 bytes
SHA-256: 2c95fa62236eb3d1601d706d727d51c0c3f633320e2b6b440dbcf90ee3f66275
font_01_sfnt_off00017539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D50 10260 bytes
SHA-256: 6ecedaa5baeefec85baafa23ce515030410c38f59747e7b1d6e80e21d69d8704