Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5cd2cf9d87638b…

MALICIOUS

PDF

67.4 KB Created: 2021-06-13 19:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f616a6ec107b3e33504a10a3db63ae30 SHA-1: 199e80089c9ef49c63d521e6b59b6487e8a29a0b SHA-256: 8e5cd2cf9d87638b0a1a16c252c1967bb6a263a4e6029456b672c0b826da4602
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=pokemon+red+gameboy+advance+rom PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a06798bf5c26a0f0428242b0142c2192/ninesadumesanis.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/marolumaladolojup.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/zetumikerivudafaliloxit.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ce11a0b3157aa962b09a534d7b7035c5/32719855098.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/li9kb6acten3dkqubkjdi8rh66/64073150842.pdfIn PDF document text
    • https://dineflon.com//files/4958531460.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/212fcf22118248054d8be57dae9f3f80/39111126675.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/41c382284563c7b315b3666d35763ba6/wezumuroxuju.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1f86801b---kutavuwalipajepebebabotes.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d36d319b3---58092657165.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/64849f2f07373515c903c34c8dfda641/95448056404.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/lalelelotafedami.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/25954271548.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcf57c4d8---92327586349.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5feb0d8242---rupojawexuwawededoj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gpr2c5q9ve6fv3q004c27d5bc/36091231252.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l7c2qq44ld8n59fnn7477k8qd9/mawoduxugufuvabowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/36669146793.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 5416 bytes
SHA-256: 00a74a45d6006ba94c5e42d88f4be1163135bc81aa9a0ae167fdd27c08576a0c
font_01_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 11136 bytes
SHA-256: 9acdc550bccc30662ee01b8f95458aba78d0ae5234a63ffd0d50951df8758b22