Malicious PDF — malware analysis report

Static analysis result for SHA-256 445a4061ac946282…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 14:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8642e2d2c0b9f5f644b01a5afec8c92 SHA-1: a609d836099a09d2dc0f996e05a87efd8036c14e SHA-256: 445a4061ac946282864199e8072e077a726bd5a627a9624cd3b6f3140b3249a8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links to potentially malicious PDF files on various domains suggests an effort to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mousike.it/img_ins/files/67963157273.pdf In PDF document text
    • http://analogsys.com/uploaded/file/1426388399608fad4c0001f.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6e15fb2c9010e3206e7fada3122fe6e9/kezod.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/89156471269.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75bacfb0560f35bd7857ff3e9d74fb41/13709323301.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/76544877885.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a403f785af3---99787676079.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a943329f588---14641045058.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3ef1f6d4---64115983511.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/61421006839.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/xepop.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160742598205ba---38092237470.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fef2e1e00---pilogunigusasuvi.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca785bd764---vakevokuwisino.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/bogom.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/9128985059.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/91435120588.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/jerekar.pdfIn PDF document text
    • http://topstec.com/d/files/mejopabogatupoduserorari.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/piroferogaregifozarodos.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f73699355---3717828495.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/31967784270.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c203ec85---joboboxenemubapawoxojego.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/49563618553.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/zevarajuteboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=three+careers+in+cookingPDF 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10420 bytes
SHA-256: 65547faaad920dde4ecfc516da3607c3b8b34ddbe7acc692d5195c613568f961
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16704 bytes
SHA-256: 9336ff82c3ed367743d80a1b47970a31240fe806dfb517576485ae0d85db4bdf
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1