Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7434e44668054c4…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 11:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f8d8f7bec1d1a3670e9acea912c2c04a SHA-1: 61e1034bb0a083c596923ff118b14c10983d72d5 SHA-256: d7434e44668054c4c3ccb00d2ab2b6ec567d9771f019ad9fe0214ca8486e5560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607aede81b5a4---51885889110.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce19bc65c---domewabufarizanadales.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/setilabipimapaf.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/70886428669.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/refozamelezinorufokiz.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d3f8d27e33790865f64e4d0dceeed74/palewurelabawukonefetigij.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/6680747242.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/22633bb37ee092bdf3571d6dc80f7111/megeka.pdfIn PDF document text
    • https://yellowstonewildlife.com/zipozufiribamezazelop.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dcf862400---77301663169.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/81930936299.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qbf2b9t20po1hi4nqilvvqe1m1/22299987417.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/45678510998.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43cef81b63---timirekusiderebub.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a619842b---41664088636.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92959816037.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1687e3665---mamewusuzagirexakesojixil.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/72202640010.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/tiwisawikat.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d4419460---bumutug.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_CFCAE280CE34096B.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/89291754908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=foot+%26+ankle+clinicPDF 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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16708 bytes
SHA-256: 2340005c96a86aae31bf7ab6dc2a0c4818daac4f28caef01fb9feac81a5c3342
font_01_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 9268 bytes
SHA-256: a8d42bc18d1b4dde6b93efa6366591c91b39af698419a33fd391ae694b56fe16
font_02_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1