Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2913bae15d90dc4…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 12:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a85bf671fa366f2ec88c0ccc1a32bfe4 SHA-1: a6f9f9fab28f91b190b9af32d9daffbe3b908431 SHA-256: d2913bae15d90dc4d7e21faeb26e50809021d495a83d8d74a528e996ff980d80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with a link farm tactic, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://aydinservis.com/ckfinder/userfiles/files/xadajewuraf.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/30057942754.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086952a7194b---15541587696.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1765efa9bf00abb638f9e993119d70e/28687539812.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/17894894363.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/75849451385.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/49a566a014111c61aec9ef0cc61fb343/sitikezumafonolekojuwu.pdfIn PDF document text
    • http://citra.cl/userfiles/file/loferumavif.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85814951968.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/19743757264.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/9016124186.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8be7478d---dojafilenisowof.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qblhn8ujvp7cjcvfkppkqb3gao/70132448557.pdfIn PDF document text
    • https://protrialse.eu/files/files/bekapekelixetuxasiwexup.pdfIn PDF document text
    • http://irinabailey.com/upload/files/dolunomuvujajiwojawetifew.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c67c347---wetenoxejewolupixedatun.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/23010706343.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/farofijuxopabedofe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01f93e35b---rupikifawapagibimixog.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a089352a0934063989bee0df594955d1/61329649957.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/panevemasi.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kaxivawodeda.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faba91a613---19318001279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pacesetter+leadership+pdfPDF 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_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 10492 bytes
SHA-256: fbd9d302874a94606fe967d9941f95f6d4985f356c2c5c8ad3b61117e99da920
font_01_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 17980 bytes
SHA-256: 4b74ae8abfa769aab8b4bce9796f65af26c3398855ce8c5ddd3ff6549b382bac

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