Malicious PDF — malware analysis report

Static analysis result for SHA-256 e269b5273350d230…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 04:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0130f6d9a6a38bae4492c6f440138611 SHA-1: 4ba3e5fc2aab7cba8414a20d46ad3efa4b4285c7 SHA-256: e269b5273350d23074c74cc39591833b16e617be85e57de361b3bd6824cc400b
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 http://bobiniauto.com/userfiles/file/91685337531.pdf In PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/zugovuven.pdfIn PDF document text
    • http://atomleasing.ru/media/File/76161647043.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a5597c6ee3df5c3a36d97d117de9921b/kijuzosozomudino.pdfIn PDF document text
    • https://2acontractor.it/images/file/60693650583.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8f6cd43---83748779311.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eb702e95cecd38c1f2ffd86b147c79e2/finimarubaxomulidini.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e3423b43b8c10857a2489cde501ce750/10238349434.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/43881592973.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/8844b52fdaca48ef526c32f7f82d5afe/dubewulalarifudafujirem.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d9c75720---50254339487.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/89182097236.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/775c174227a59fd1460be3fe4756262c/9437778709.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbe3bdd11---11737491160.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/jafinim.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/xotawido.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/13871522478.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jovobuzafuvomedapi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/newoxezoda.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3dcb20b0a---ximolitonupo.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210708_0589FE61C786B209.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612d52d061f2c---fumepubi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/61a6ce353ea1f80b421ba248ae84d876/metefigulugabixali.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b68bc749b85665aaf6d4b76514012f2/tufimeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+110+kgs+to+stones+and+poundsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C9 16432 bytes
SHA-256: 90f37ba2e0dfe57b943bd387e941160e4bf8029591fc840b8ae8e0da70ccecfa
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10892 bytes
SHA-256: 331b14201db17851e877db2b3cb0e47776732fdbe1ad853ea39328942d9ec45d
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1