Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f0ccc236045206…

MALICIOUS

PDF

98.3 KB Created: 2021-07-15 22:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16d24531c7ea355d568dcbdd41078d4a SHA-1: ded83723f2519f0243b1406935cd47e6ca625ab2 SHA-256: 09f0ccc2360452064b5242f96e48c357fbb5dac6cb22a680896dcbaf37395eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/890629757bdd821972122950b59e5176/86113170541.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/u6383phf49tkd3uutk55a2u6bb/sizokeliludajo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/4d72e8570bd0a1877fe152e901608ee7/masapodux.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cbaaea2489013d09a175a33fa80db45f/loxejekimojituzopigula.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tosizabodajafo.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106201903567376.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/maranometubakinadize.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/18087772685.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gevezulapiwakefun.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfa6ebefc---xekoweteginagije.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/wesarexu.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/julufibugibes.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t67jpt9pfbeo8b4rqir0cq56fr/fofusokupudowatedida.pdfIn PDF document text
    • http://allycatering.com/userfiles/rewopopekufobigana.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/funomoxijakuveb.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70511907506.pdfIn PDF document text
    • http://novichiha.ru/pic/file/10200237775.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f91add228eae2301bd53d6ca3b16d67/kesedugegifep.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/oc3grlai8rce0gd5opgb4up4hu/waluliwovud.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/mefebepanibew.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4887581b5---84596196209.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3d7866d4d---wizatugoxuduzatelutu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/valipogexu.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jivoxukotaponukilekamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+key+molds+in+the+escapistsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16164 bytes
SHA-256: 3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 17220 bytes
SHA-256: f371ec0b1b0b051451ac99323eeaded6fd218b875a321cfe7fa6a0b2f5687877
font_02_sfnt_off00014a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A10 10960 bytes
SHA-256: 1154ada69b5bbc491c8f823e5c0b41415ee13147475f88cccf2759c250d83de4
font_03_sfnt_off0001634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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