Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cdbf80a73bd9b0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-23 00:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84293f60e32330aa7339545e975e7844 SHA-1: 82402c91dac10cf7bb2b03d5d6ed51c697ed90cc SHA-256: 91cdbf80a73bd9b04ea16ccd66d9b5771238433ff1cb80a6c953907fe9604e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=how+to+block+your+caller+id+on+android PDF link annotation
    • http://dtmaso.com/public_html/Imagens/file/15816450790.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/zoboxe.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210910011051.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9290f70d---52721851463.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/rafasuwolatafiwezaba.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/jomisa.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sujakutaji.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/75323800882.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/ziwivixiw.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/lekevinomosalisaputinogi.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jozanijonetonigezud.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xojupowafifoxebadolor.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109170002487028.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/77023018403.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c1abf7dd---20449975875.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/27494027154.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/monosebipipopusogaxizofun.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/ferifadagenurijudinaxe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22e3299ea---30890189775.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jikivurilulibemixulos.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/luwakoninujizotidutareni.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905170138.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315625cad14---mexasoxafazu.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3964734825.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zejaputokurulolopanik.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_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10720 bytes
SHA-256: 2296471dec08fd1fe27c749338a9b9cbe74330081e46c54ce991fded0e130972
font_02_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 17488 bytes
SHA-256: 9af6b7178b815eae270671043bd9de37d967eb07c676d78cb68838c363f1be00

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