Malicious PDF — malware analysis report

Static analysis result for SHA-256 204c3ae1abbf0759…

MALICIOUS

PDF

100.3 KB Created: 2021-09-07 07:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db673e9e459f49d1dcbf849dde2e05b0 SHA-1: 7a57c628fe6d0663da3bbe01085a06419d85786b SHA-256: 204c3ae1abbf075994db5f83fde24bab21c2467de57a89755231136d039fbf47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=fedro+platon+libro+pdf PDF link annotation
    • http://garderoba.sk/images/_file/misubovitonilo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dmk34evqaeocuu2atcu75tq956/fonanel.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/71302058261.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/55885035350.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/rinovakotel.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/45334919235.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/mulujodorodo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e415391bc3c40b1b0e23e632a52873e6/wovovobupuzo.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/85579258801.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/wojanavowavovizarakome.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/64733434310.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4e54fbc0---34708787447.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/37695514969.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/051ff176ef7de5bf597f6bf2fcea0abc/63248032042.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd572f7b1b8195b3404fdee33e872b/40424887322.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rlqolhseo7opcbe3d3jmllfqb7/kazejewegomokusar.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609328c1ead64---10542329592.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/35920249686.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/poxerinoxaw.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/fevanexexubutuxilejin.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b05bb5ff1---depomusosepe.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/moribanoxezirotijetumegal.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ed8dc300fd9eebfe9e6b913af1a3f54c/16619140043.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_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 10440 bytes
SHA-256: 56b2d2671285b19bdfa32f89a588b5981df4e1bc820a82350fe9703cc7a1b402
font_01_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 20312 bytes
SHA-256: 33a2958c361c847fef3a92b39500cba46aa0c8808a955a473c49d5a97475db82
font_02_sfnt_off00016bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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