Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32d373628e643a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-05 20:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3273434984076bbe81c1025ebfd2d2a4 SHA-1: a0a9093546348a8bc55bcb786f714bfec7cb1b69 SHA-256: 0a32d373628e643aed149f7b4b07a5075c0ecbfd0050575530e976152919e03f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites using common form plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/krnub5e7elk4b6fa49t3thl13f/19783397243.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/553497942fc722982d584360d6ba9f1b/tosapagodamub.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tiderotasovisedox.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbcf99836---pululapaxesajoki.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7a6688bb---51747905549.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47b73b5b174aa3c875215df85c5bb5b5/sesim.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/sidurubodafatopux.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581a3814a8---tamemizikixewuxos.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/xumuminirapolilolado.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14af6c908---56791980629.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/61562328515.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34026171332.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/73064311148.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/847598008831fd6a5e9703d2e5a549ed/mupop.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48157677109.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/kodizitepefabi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4548655971---kunivakuzamudolub.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/jowedoviresemos.pdfIn PDF document text
    • https://aokman-drive.com/d/files/mixagobesodute.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d30d159c2d9---22333229727.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1e11a026---30688939463.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vigd45rqhmq13g887jkl6gibdv/fubomevoponu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/pimuzalelokodotiwuli.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/sd6apq1tersqt913svbnh1bs5g/zulazu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/61340468609.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/55122398959.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4afddd651f---loriletosiforekorireruvad.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/lukepibigesijujan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=moments+of+clarityPDF 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_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10604 bytes
SHA-256: 4f1f5c1f10eb88611b0920c47736145d1b6dcbc7330954cc127a327d24f2da74
font_02_sfnt_off0001396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 18692 bytes
SHA-256: e320a9eb97e52d438ba8503128da3700c80c6f1e45b1615049c6433a7e3a38f9

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