Malicious PDF — malware analysis report

Static analysis result for SHA-256 221cd287adc5d329…

MALICIOUS

PDF

103.5 KB Created: 2021-08-23 14:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 1768dc0c1584a7e6178014c0560a8dad SHA-1: 7e6797df6454ea121f46e8ab229df960b2be9693 SHA-256: 221cd287adc5d3295b1b25b8a23e0bd131f143282f96d37ba2c227fc64678187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=super+teacher+worksheets+probability+answers PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4fb422428---76504214165.pdfIn PDF document text
    • http://dalaichau.com/files/totixafagilup.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/98872635727.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/47685602599.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b544053a---24491818718.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bifoxusisabupokunofeko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fatibekiwowezamumevomilex.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bukuvirufagedanob.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210816_140451_125.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/71517317273.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd3d9f597---3801241165.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/tejitisem.pdfIn PDF document text
    • http://stonebreaker.at/26839250082.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5htpm5m0bhrlht6sajrpap41mf/dejorumizuwagizegisaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987dab3a77f---nemasikifuviwugofosurek.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zefonevagibilujufolu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 18224 bytes
SHA-256: daf7eedc9c65ad6f3969d599c9aae0e2a157fd870fcd05e6d1cd29d6198719d2
font_01_sfnt_off00015e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E43 11080 bytes
SHA-256: f27f4ff7a2292cccf2b1bc79342bedd4448796e86d4a19955bbd4be764ce6c35
font_02_sfnt_off000177e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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