Malicious PDF — malware analysis report

Static analysis result for SHA-256 26008d00fbf4d7b8…

MALICIOUS

PDF

96.4 KB Created: 2021-09-23 00:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8120dada5a6f7585123f65a33a0728a2 SHA-1: 3781d204c62d31641c69eef9f61a27660e16bb58 SHA-256: 26008d00fbf4d7b8797aae8f785f9f2b80ca3746e1cd8358e7bf00239d938160
216 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically requesting recovery secrets or private keys under the guise of an update or security alert. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or download further payloads. The ML classifier strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://medvor.ru/uplcv?utm_term=update+api+level+android PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16137468213804---pemexolavalajewe.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/fatazilijadagezegake.pdfIn PDF document text
    • https://tuinvandecruys.be/file/jaduvonuzaxiwaxaket.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57394cb64---70546273129.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/c4sn1bjgpsrm2oejcg9ah0us06/30298950716.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/68171686219.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/fee1eb79aa11e4c83b60197ecd276667/jojukirijakorenes.pdfIn PDF document text
    • http://marymo.ru/uploads/files/47224276525.pdfIn PDF document text
    • http://pmke.cz/pictures/files/88489470929.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/9724053463.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xinodanojamiwukiso.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/51062441601.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/wajawep.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/91852476250.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e0abb84f---57902221089.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614b95e8d5fa5---felixenirakorukotex.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/29574119351.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/bazobuvusasinizuropa.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/72037805580.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1acc0c6a7b28a02368a45d91b4bd74f4/92398612445.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_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 10292 bytes
SHA-256: ffa8bf3eee7f6baccd78d95ffa0dfe78fcea6851330635c0b2df6210697ec78f
font_01_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 18720 bytes
SHA-256: f3cf23976df07fe123edb84b438b5db9c7694c1572c1feb349a7eeb36f262c75

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