Malicious PDF — malware analysis report

Static analysis result for SHA-256 4930b91f05ea53c0…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 02:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b77f51b68ed67020d29697cc799b898c SHA-1: f70607a2d86c096c08b22738a949eaf8a434d631 SHA-256: 4930b91f05ea53c0eecbf9d74d95705cd343091a1dbe10c00520c5a69aa2e641
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5742cef819e867cb4e6c9a61474358b6/98397193741.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34d463fa5---rekojewe.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/29af06bdcdc37ad67cecb55179766792/39827148972.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3336603e6a2b005dbf6a829fe930cae1/kamipetujeg.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/38i79eu7r4fvtmvhmjroia9du2/xejaruw.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6c527fde---59497590974.pdf
    • http://citra.cl/userfiles/file/xewozujakegezezo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/322574ba514033f109aac25f7c392a65/xesofipofuwujulog.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4057306d049343a433aea8ff3cf86896/64439492751.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/60686558723.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbecf7face---86356221993.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097460e0ca5b---welilidovojisoruv.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e4f451916---fegeluwuserawu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ik3ut8mvqp5otu2d5uf06cvhoe/kemotisas.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c5f06ae2---24938203461.pdf
    • https://baigiangtoanhoc.com/upload/files/sesurosiposepizo.pdf
    • https://strechybenesov.cz/content/7530520871.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160762252199b1---32713859735.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/1fee51637fc4b4e68538e7ad59e781e9/86809800717.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210626045532.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a1982f8b5aeef1916463218033fb9bea/37603305261.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa685ecf12d---godanele.pdf
    • http://busankid.com/webfiles/board/file///tovidewexituwakegidewit.pdf
    • https://alakharia.com/public_html/userfiles/file/dedijidufotuzo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=somatic+cells+are
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
font_01_sfnt_off0001040c.bin
458e1a0e924b6eddfd304a35ff341d97f81ba5e80a53a26408b80418bf993cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16776 bytes
font_02_sfnt_off00012faf.bin
56af607cf9c491df82efe93451dedc6159901b41048953b2445b60485ed9bdfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 10360 bytes

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