Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc78477847465f23…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 03:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: db99db946bdaa891ce4924903b4b556e SHA-1: 2a0be517cf5843b5554a55f220da08f501541dfb SHA-256: cc78477847465f2327870943a03e9dadd083b73893ae4f229e0adb6af9bcfbaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with spearphishing attempts to lure victims to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=principles+of+corporate+finance+10th+edition+pdf+free PDF link annotation
    • http://jeanthompson.nl/ckfinder/userfiles/files/8447355530.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/pikawajanatukaw.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/18422c1d4584449db0c36597daf55325/41690664510.pdfIn PDF document text
    • https://stopserv.ru/files/file/35341321843.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a552b7fcf---83967820167.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf237617b4---45845217263.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/84289854352.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vae6d13j44meja71mt0tel2qp9/97451539460.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/mixinemun.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/44462041129.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf2e91011---25541896940.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/wuligigalefuzufunaboned.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/872b3b8aecfd64704426da8860d98b64/balajexopaded.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a505d51fd---figulikelezaxo.pdfIn PDF document text
    • http://kaies.cn/upfiles/210630170844643647ldvcnc.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077130f6bad4---manibewizozerajelujakisuz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vurefajixuzaj.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zafurokiwuvuxixiwejadoj.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jujejelekozapak.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2dc377490---xatesobuxe.pdfIn PDF document text
    • https://digireg.ru/upload/degititu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/26c71b02daa4896a9767ec0f56fc1230/47597404136.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210714131019.pdfIn PDF document text
    • http://sivam.pl/files/file/rawumele.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5674d9e6a6af059785f7161aff3c1ef6/tesepoxorip.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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10892 bytes
SHA-256: 714d4af7fc4d208c46c961e916189e3f8a8ca3fd0422a95298066b1f4c2c50ac
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 17388 bytes
SHA-256: f4799daf5aae2e6ea273f4149bb807f68255e230c1d31440beb72dde0138c6c8

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