Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb22ebec3d39817…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 01:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 525cb8979b02a2588d4976477e5f4127 SHA-1: de6e05a314aa8410ea4017c374ee49e1609508e2 SHA-256: bcb22ebec3d3981764da42a9e7d9d89b112f2b78d39b769b939619d557710192
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade security scanning. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or link farms, suggests a distribution mechanism for further malicious content. The document's structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://comitatoamiantovelodromo.org/userfiles/file/gaxabetinusiwowesufazogew.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/36107896179.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/52414899521.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca0a3fb62---41843806357.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/43u5u7rmc006fljb6sqh0fo002/19378880934.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/76158199609.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/manipepaku.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dilezad.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jakepuveg.pdfIn PDF document text
    • http://baove24h.info/upload/files/xebutu.pdfIn PDF document text
    • https://halead.com/uploadfile/1631886594.pdfIn PDF document text
    • https://funbugs.ie/files/file/zafusok.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/kigebuwovinejuru.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/gudibefadixibapebe.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210907_163439.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/43408610942.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/32827007279.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddf2232f0---jezorimopiwutasu.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/71628862665.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/komololirokeraginexasezu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/41383075263.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc11fb06---dotaresag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+cheat+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10468 bytes
SHA-256: 0915ccf1397b7c6074bdad02529ac28c787cd01e64673ee9222155eb681809ce
font_02_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_03_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 23932 bytes
SHA-256: ba5658961e9c5e000f28cf372733e738bbd1ea1f763f32e17f33d086d9b158c1

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