Malicious PDF — malware analysis report

Static analysis result for SHA-256 7490b941e238d545…

MALICIOUS

PDF

77.0 KB Created: 2021-08-11 04:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62fe63f890bc561ee86e1af06e1f509f SHA-1: 6b311dc0160186d621eced5d8f83103fb501e94a SHA-256: 7490b941e238d5459aadb941fe2e9b6d4f9f579f954e2c4401699497dd7a329d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=inorganic+chemistry+miessler+solutions+manual PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/150f17cfdfb90151673c141f36a85ffd/30733018473.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a7210df27de5eb1e85a841b6c084be06/lutevimusotepep.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/45295ac2e54abde1e9aefb0edd1f3e57/68696045287.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/jalezikuselodasakububilem.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///wurinebugesomejametib.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756908c6da2---97546493353.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/folidesa.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/56935865885.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0122c199cf---6181960986.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d2b9572d7e3744d6031032237ce29899/52034449609.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/74262107852.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/jipevejorotajirowekem.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10646c547---33398837867.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6eg0h1lesmo33aj0eup0a6cr3r/52142665089.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/ruterisas.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sm52d55vaa09njo4a69rs1up84/tavapiwaxuwefoxetaru.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db82b0f6b3---4912492163.pdfIn PDF document text
    • https://equalland.com/uploads/File/38759365528.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb82577d1c---kefejefemavitadopojipi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/uit38k8jbou8mptlkl57esvqc5/79567212857.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ocjqsjoroo578bm9bt08vcl5kl/soxavixazaputimakamutiju.pdfIn PDF document text
    • https://melz-feu.ru/upload/75805697195.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/6087552812.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/67749136133.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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 17180 bytes
SHA-256: 9f189057ee46a60e3ddff29efdc226a3de574fb7f05d0ccb62c0ff732e4ecad9
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10844 bytes
SHA-256: 2962255bbdeba6a301b450140963531330c865a8741372c5242a52a360211bb9
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1