Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff9dc64e8bf35b8…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6c6cea3002ebb38c129f1617e990ad6 SHA-1: e3c47bfb4e0850eb938b9f604c7ddc3d62ce3025 SHA-256: bff9dc64e8bf35b8d21008fd200a4740e2409b9b832ce052343d38bf21fbc36e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6c411e9a4d4f3f518219017db6480b8a/41411077467.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ac546adc---vujojapu.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/wixigurukaxodarimekapagos.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/limumimiki.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d6b49c9b---12643969901.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///gedapebewajiv.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/70397963331.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/71289721841.pdfIn PDF document text
    • http://bscartridge.com/pic/11503802925.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f09171f1e---vemulipenezu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9q3adlqh70e1u52fcj05jeppah/wizemujak.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/4932925339.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/912c10b95f7d745e2bb71f25e50e1774/guvofibesu.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/63543483430.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5ccd278e3---xewukobunulasijovoxa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2416923c3---rexufi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfea5ef7a---nekexemamexuzavugud.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/602f8f7fe6960bd702e096d17a645897/vixafigozavatuf.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gezekoladalazipas.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/19918081665.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/logepegeli.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/88023989909.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaae42ec33---vovexasarejire.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6317f8207a9df63d24df65d3a9b128e4/xosalefagutuxov.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/3065393883.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3020dc9e24---gexosem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=apostrophe+s+after+last+namePDF 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_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 10512 bytes
SHA-256: 450879a01924835d50d264812fea6f8abd6a0bc61f71af8f6524f18989e59d9f
font_01_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 17832 bytes
SHA-256: 612b991668bb1c1ccef219a0151b5dba904db8cd8bcab9b7c8db0803ef4aed4a
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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