Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e23fea0ba8180dc…

MALICIOUS

PDF

83.5 KB Created: 2021-07-29 19:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a19328c18d9666df2e4ef466b1c8b4a3 SHA-1: 6c502a67487464b73199e7979787075182321f97 SHA-256: 3e23fea0ba8180dc8e9d16c40c9c71296a65c0ca3772f4975c41018d03f40df2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=la+bella+ceci+y+el+imprudente+cap+36 PDF link annotation
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/41859554873.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/seramibox.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/gojonatojewalut.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/aed0cd4c0a7bc1e11e8502294fcd8f6e/pinojafaxola.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/51889357626.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b438435de5---punijavupiwezuka.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa12c06806---nutelitimasu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/98298754785.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/cbd56332f72d9aee9847e82d4c2980fb/8373893202.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf3040e73---tegupilem.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/gefakiw.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bbaa4154f22947203b7e2549487cfc73/wogeriw.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/nizetajufemowifonamo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c463e63722b---xewarajizejusuwepoxuf.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/3469095926.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/84268419023.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jivudipuladutuvugava.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/50975911796.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee3ead82e---gimufofurofuxanonozomebu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3c170697---63558986542.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a4fb2b3f---vokeledomubofav.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/45084754393.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e318f1944d---22667190312.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 11036 bytes
SHA-256: 2f3ff8acc5c27560b763c2ff6910614d9592a917662e261691eed34121aa432b
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 21416 bytes
SHA-256: c3630c5cbc2597cba28a3dab7e97e7b4018b8d04fa3a80a2f6f14defd1e097c7
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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