Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd4ddab9efa22f2…

MALICIOUS

PDF

83.5 KB Created: 2021-08-12 10:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0188d8546611a91b8e058d88b15928fe SHA-1: 35f2a6ad8b305e113bc2f438096a12e1d1786322 SHA-256: 2fd4ddab9efa22f2ed20ad10eb88deed595d613dfa2b5cfc7bf1761b0c01198f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL analysis are sufficient.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://lacecinella.com/writable/public/userfiles/file/gobumoxerazapiliwixado.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103cba94847d---53373701508.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e30edd87f---timanivijivu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/32067172828.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b52c2ecc917---sozolakevumetuj.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/17623853181.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8f4dcc390f7925f1064d0a19d00d6312/tonarapuxesasogow.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/zejejujanojetij.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca283abf9e---direfediwagidavup.pdfIn PDF document text
    • http://119pump.net/d/files/dematitetinojelikov.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/38019015458.pdfIn PDF document text
    • http://teraval.cz/res/file/mufodutisod.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i1mfgcgrskkuejs7p08pqt2535/medigadobumudulitaxomotu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1fa4c6c01306134a32c7b1c635de794a/276114111.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/038e4a6181f8af23908481572ed2ecc6/tojekeso.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cddf483a20dfd0854884b70cea117f07/51713620262.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mduuhcqfdsci1ljkksp16fpflt/16485239124.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108010600598254.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a291fdbe3f---raxelakukufokarolaje.pdfIn PDF document text
    • http://dentali.cz/files/files/27676508595.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1de38d02---ligogewuluzakatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=examenes+muestra+unam+2018PDF 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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 17636 bytes
SHA-256: 09c4e7450183fe93bd2875a80abca54fe1f3d84cf4643d1c7d093fb72f31a71e
font_01_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 10700 bytes
SHA-256: d34805c8030cbe0f5d9fc56e1dc86b66320ff037613c8c34db88ceceb63c97c9
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_03_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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