Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c13ae0a1e3f771…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 22:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c872011795c1f29bcdc1c7eda5343707 SHA-1: b79a6260e951ed5f8e6066b61bbd3d318ca3f0ca SHA-256: 88c13ae0a1e3f77117cf62be7a55e6bbf8fe70f5989fff1bb0c98406fcea5625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used for phishing or malware distribution. The presence of external URIs like 'infrive.ru' further supports this, as these are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=foundations+of+education+allan+c+ornstein+pdf PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0cbbffa---70548110598.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7a075ae9---jukowa.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/lisugavukabasetaxa.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/14805951988.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/zunegizoz.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/73458023872.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/54883221286.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5925ec56f---furorowa.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210811_032558.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d76e87de5a---porexexoligabafipi.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/rorivozupixekopabajetuk.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/39960824872.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kubizo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xojegu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc67941779---64434583321.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/25130359494.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/da57188d69abb836124776fbe0275693/sevulituwenidefefiwigite.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609844b5409c2---62748225461.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/wusim.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xobudafexavuvimemimusi.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/xufow.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/61792297204.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/78869165521.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210626_212400.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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 10688 bytes
SHA-256: 084649587a54be0bcae0d952c6534c855dc5e6bb10bb0ed3db167623c4a91958
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 18548 bytes
SHA-256: b42b8cfd05e4030aa521709a77aaa7c6bb18e1071631cf8e9d049da425ea7b28

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