Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7bbae72e3cfe73…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 05:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a0220fb647f0e26cf2d6c8c7ac1b2bec SHA-1: 8db2cde686015b931731b328058e454af6a4e3a4 SHA-256: 9a7bbae72e3cfe73ff4fcecbd823d8ed11975ba5429601dab220892166be07ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a compromised WordPress site, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a compromised CMS upload link farm further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac136e6d6a8---35357665745.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/nenusakakojerejibenunikaz.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/lesarazosividuwapugurili.pdfIn PDF document text
    • http://cpils.com/userfiles/file/20541412077.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba0e64723---90933977514.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ofhb6khr6hm0suj79fs9827v32/75958971505.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/40424874293.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/db83c4020b9fe0fe1212faf8b04f57a6/tajol.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ea7oi9he7ntdijiodlp1o3os9h/3318629276.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/xuveviwupovesufoxamogo.pdfIn PDF document text
    • http://aps-mes.com/files/file/76342591198.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160917d9d5b3f6---10548782853.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/7594967652.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/atgfqeqkmkstggnkbnkn9gq6l7/kepuvavonapawujukemog.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/mubinutuzorodazi.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/77943692512.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c256b04e46f---todejefudu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ae54ce850b870c66434cc9412191bbc1/75746960534.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_181224.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6svikkt78nk05hc0930bv5uqni/zibunenonafepimikako.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/tezum.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fopiguwemisevevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=modern+particle+physics+mark+thomson+pdfPDF 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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 11084 bytes
SHA-256: 4e4ebc37bd2532f3878ffc738363377f469bcda747a8283318797fec46113048
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 17096 bytes
SHA-256: 002833bc935b37104a60c71a28e37f4c0048c744730ae79a43b1f3384cc677df

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