Malicious PDF — malware analysis report

Static analysis result for SHA-256 279e6ac5765d43a8…

MALICIOUS

PDF

94.8 KB Created: 2021-07-13 02:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7684a5106c0de4f22c3dd2e62a5ce012 SHA-1: 8a349fac2f84840fa27e55044f5b22dc930dfc56 SHA-256: 279e6ac5765d43a810de0d66c36c7c1c951c9f2c10eea845fa44b1e5ae596637
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and numerous external URI firings support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce53f74d7da089ee0acbee5d29ae19de/35436878998.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb8d882f4---zuzivutej.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609772dc07185---7855996460.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/41889497779.pdfIn PDF document text
    • http://medica-brno.com/files/94465276511.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/ravonepanerilemamirolatup.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/48475289893.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da107332f3---fofedisu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kukapuvunujinar.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39384163a---zosadakojidobopof.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608019c5b66da---vubisunifanakonaji.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b228d8c20ff---melupedetubuzirixu.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/53380191719.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/67213885248.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0b4g3anal0s7rls9dp3j2ob8da/37047170775.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/siruvurosatuz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1739d957c---48419170575.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb886ddc4---23974836186.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/60497494738.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jotuzenamepexipibawikovon.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160986c9105078---tawerakurititibofago.pdfIn PDF document text
    • https://masihpt1.com/contents//files/19725960492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nutrient+rich+foodsPDF 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_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 16700 bytes
SHA-256: 2e6b2ac2ede51706ddb7a611f30c41c7b1a87f5b67fc5dfee6594f4ed14aeaa9
font_01_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15532 10440 bytes
SHA-256: b79f887d932ae6c7716df90c024a887e34d8399a460dbb6dc4e43274218fa64d

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