Malicious PDF — malware analysis report

Static analysis result for SHA-256 65acb3a232576fc3…

MALICIOUS

PDF

98.4 KB Created: 2021-09-01 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afe31f9280dee714e195251387b0f34a SHA-1: 397bd1c3232cd6eaa6dc842c312b2e3a47a21b79 SHA-256: 65acb3a232576fc3529d1a2dc52f5e15d6c5d4c9bd693fb63572588a94c54c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cosyromania.com/media/file/romozubajivexavimefotu.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686b7d67f8---sowepil.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/pukuvobuwupan.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ead10d80cd06dfb27870b89564f66672/puvenigozazuse.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-14/20210814151556543241.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160802e3d76279---mimitun.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7e1ec474334d49fac310a499bf5d20a1/paxufijafo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b9a065f1---bapoxajimitidasiwegivami.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612607cf44eed---musuduxivuropizet.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/75328214865.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a229a71e973---jefolu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7a9740bc5469bdc5002f5f37235e593e/22597029892.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/71766377764.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/lazagomabuvaxog.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wusalibamijeguvun.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/bivaburovobudoxawu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jonikilurokilisevexadiga.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a09b1666---gigas.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zedaberetoxawanesu.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/zuxabejujesasomawok.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8tn92drotgmfsnmqbirr9jdhmu/63477060796.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/fibodedilasusevupav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=warriors+and+citizens+american+views+of+our+militaryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 11056 bytes
SHA-256: ebf4ae74b35fc6e65e530501e0bc470da55587b20be044f6c1b2135eebd6effa
font_01_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 19716 bytes
SHA-256: b361e6a6bcc250abc2c84f1091394be204798ab7af8965ddb056806d6fd55867
font_02_sfnt_off000163c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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