Malicious PDF — malware analysis report

Static analysis result for SHA-256 66334dcd2e73f59a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 00:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36f06cbfef393f53f21fc33b491b6450 SHA-1: b394b0675e37d3d99c7374fce775cd9286a305e0 SHA-256: 66334dcd2e73f59a77a5fa8576a864a75364c26d927cf2fe6ddbc1cdb8ffcde9
176 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=manny+mod+apk PDF link annotation
    • http://jjc-dev.com/userfiles/file/ledaviw.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fagita.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/20582594963.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/nowabalurufifiwitonesa.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/makibapobimajipagosafe.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/21671345512.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jimudidanev.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400a9f57b27---15208973301.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1f71afhjmac9t5k2ju6c5fq7e2/sunafurit.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/45520957834.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/bafuxitoraxosasa.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/luloju.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xebanodutofo.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/65339066201.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/23599671528.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vujegejotuwe.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/61599646918.pdfIn PDF document text
    • http://showpelec.com/data/file/20210916_012314_524.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/50131500001.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/46122630215.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719563ead3---pokezuludexazefasu.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/1428798752.pdfIn PDF document text
    • http://machulski.com/public/file/52775336038.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/85888158509.pdfIn PDF document text
    • 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 18420 bytes
SHA-256: 348109e1bc1b7a6107d1a7c86170a9e339b14045a1d1db9d4bdfa99a0fcd8bc6
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10116 bytes
SHA-256: 186186347d4a44c470d131f4df2d18b72c91f9a450e8eb5b121e1e445bc9b74b

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