Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee2e6461ace335e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 05:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04f5c9e29fabd39ee16a529f289e86fe SHA-1: 26d5e97de789061cb6f119d4947dcc69b1ee1ced SHA-256: 6ee2e6461ace335ebd71fbb5a0d100355f3a8d8d3dbaa85dc49561715d0a1a1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://automatisme-portail-bordazzi.fr/userfiles/fichiers/topapuwumivibukiji.pdf In PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/95431086954.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d382b09f9d---fifegak.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/318434641d8917a16ec72c53ee92a635/gapizakeworex.pdfIn PDF document text
    • http://coolscape.info/images/files/nopijogakijitivowaja.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/xegubokolurisupuwesekiziz.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xavilibifenepemem.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/gokox.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090919122174.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xerujofotonekituge.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16315448327da8e5ed4f7a6ea4c8.pdfIn PDF document text
    • https://msvadba.ru/files/file/42761577808.pdfIn PDF document text
    • http://stattus.com/assets/file/punatawe.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090811245269.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/mupirijilorerafive.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/58808459653.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/95973014042.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210916091202.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f61d6d20---22182489474.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/nuvulesodadaza.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_140218.pdfIn PDF document text
    • http://hodori247.com/uploads/files/sodazoga.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/57561212315.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/21814611623.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/zuxumirok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=amazing+spider+man+game+on+androidPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 10632 bytes
SHA-256: 8ba851e0a603a5620032254ba6594184b5e5faaa544f798a597e276f8d29ee00
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 17828 bytes
SHA-256: 87853538f08a07ab5fa4ad72e210d66c831e08e566350e2ed92b06a5c07b3125
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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