Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a19e759d2fe84e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 16:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c17215329855201f374de0bf1757666 SHA-1: 379e3952929ee28d38ebaeb072998ab1359c16f5 SHA-256: 04a19e759d2fe84ead1d9d1a3184629e8416af2b91c7966b57fff63daf9bbe36
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/328dec7e84d044ed82f95550b61534b0/27481272490.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325742ebedf---lovep.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/fonosifuwitosuveze.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/geserotev.pdfIn PDF document text
    • http://njxinbell.com/upload/files/raribesavowokoperase.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03a169789---gosexe.pdfIn PDF document text
    • https://airshow-bg.com/file/lipadikobarulilejujimuj.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/11457243323.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/97030634795.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/85744611064.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/majoludi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/1299769439.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/31226863335.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/rovavugamotulidorazanoje.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/somikebek.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/57495415229.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210902125444.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fatugifede.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/30576528494.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/xumufivuwipulonemuroriso.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/vitir.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jobiso.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fifa+2021+ppsspp+android+offlinePDF 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_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 19732 bytes
SHA-256: 87215f1ea5fa23b7c34d772f4bbd4815104f5e3c902c3f04c6f1ce184020e962
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 10664 bytes
SHA-256: 0b206f2b9a5be0971ead4609fcc21218e1c907efaf933d336de1afa13f1977a1

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