Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f20b3bc24f4ad0…

MALICIOUS

PDF

106.7 KB Created: 2021-07-24 16:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 739ee0b485fa926c37d325c3a1672106 SHA-1: 5358be5a7d068c343634744bcad7e6d814022109 SHA-256: 63f20b3bc24f4ad0923aab4eb0c0334d8cb345fba944da6b69d9b0385ec5778a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malware or phishing content. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/22d0756a56c134d597319e1defa18d74/xemegowokoguwul.pdf In PDF document text
    • http://aaz.sk/editor_uploads/files/parafufawodaboref.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b250daf0---85132570935.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///5479486244.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-28/20210528002923744964.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/53194726528.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/77c362b3d3320778a4f3b00cb2bdef60/mifemo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c13d102058ea145fd05e82fe30b08894/32480966194.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037371b549---79861121637.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/13bca1000d18a04d0371ede4ecb45386/25339479979.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gajasimiberul.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/dc7c337caf15e10961df2be6d17eeac3/99288629519.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xakug.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/55876483001.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7c8857e83c5d7383c025176a510ad907/53738284524.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/50942326422.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/83343924920.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wizezosovalexubojobamo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc6a2e1c0---30730083324.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8ff7ca3c---40592401011.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d098749ebba3581e17fa790c9b2db0d7/vevezusene.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b197f63b272bff8b9abf5574c381cd8f/27693935443.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/dekudixevifaburugotuzaban.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/97c8f16d037166bb2090ef0e2f24f78d/30784917290.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/569ca22e0f789a90f68e0b9954ef9524/xebimesotimidutazojoweno.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/ronosexixonoxumagur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=poema+en+lengua+indigena+traducido+al+espa%C3%B1olPDF 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_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF6 11164 bytes
SHA-256: 7624206b3fc9f725981767e37ad9b9c1bd7bcd636c4b1093291e2baa4ce8286e
font_02_sfnt_off0001678f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678F 19644 bytes
SHA-256: 782cee9c07419bd37306bbd2bbae18e64443b76d44aff3d93c755ab174e5262a

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