Malicious PDF — malware analysis report

Static analysis result for SHA-256 21278f7b266e1222…

MALICIOUS

PDF

71.4 KB Created: 2021-08-09 02:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 276532515f7c95bec072e4d3f2ad0b4e SHA-1: 61a3e8b7fa3a2a2e1fb1cf3e516ed1c3ff033f86 SHA-256: 21278f7b266e1222f8c62dd1e751e0cd89b7a1e502417c1e446186e1b695efcb
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous links, including those on compromised CMS uploads, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cape-electronics.com/media/file/zojuluremevuwivafupifimu.pdf In PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/59626194165.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16212457365874.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/gogamevom.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac43b78437---89054860650.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/71806639585.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/serimulan.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca991b502e---nalagupad.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/98423296542.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/40287633947.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48845576fe0bc5295ee8375c398ccb7e/9074159183.pdfIn PDF document text
    • https://senhewood.com/d/files/77370923617.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a163d50a88e---23848762233.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/39896653264.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///46478998998.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/83018663996.pdfIn PDF document text
    • http://kasargod.net/uploads/file/visatopaximawovotox.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8552jjs4innt6bpqi3jbsp6r1v/76671802688.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/25c6e1a6e9844f3cd3546e55f60affd0/pifavipafatanefipimamamul.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/65718297802.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/56716240116.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a77370e1674---47291453306.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/15521815839.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/nepagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=toram+online+how+to+make+avatar+ticketsPDF 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_off0000b593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB593 15604 bytes
SHA-256: 58135c2e1f2af11f220c19fb53b221c6727beacabdac3f0b32227f1e3c25000b
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10704 bytes
SHA-256: d5d4aee7aac63cddcf77c0c3e6ea9f294cf455a8f3215273c9a247914b18985a
font_02_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1