Malicious PDF — malware analysis report

Static analysis result for SHA-256 2063f0f8270aceaa…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 07:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90882c0e6664ba160c9f744b1d093e5c SHA-1: c5b7f0c63608be82fedb1f593eeb34a616ceeb81 SHA-256: 2063f0f8270aceaa539815df8bacb689fde21cabd1b4db672f1c91be6fa301a7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly indicate an attempt to exploit users by directing them to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://esz.jp/img/editor/files/954745552.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/robizoritenubufegeruxo.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/kevobuxawojizimav.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1u6efc4scm6dq4gash85fpae72/86527170183.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/14555033513.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u8af3pk8u7vq7p8lfnf3o17to6/95752012678.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/nebosuzifebulovugiwoso.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/83337786774.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/vodimagatebefej.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/74134299494.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/vinekunosategazexubebi.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/60873509361.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/50822831745.pdfIn PDF document text
    • http://bjjiffy.com/upload/bobodefupomene.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77a5a6f60---nifabawudeputafilafadov.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/wezigevaxubuzogag.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/60505362143.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/20141130524.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa40390e0---bativuwisoworuka.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/napusesilalapewaradokop.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-16/20210916213150597742.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143213d0f8c9---wudomokupelumitiku.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210910/210910080808177494ceco3makgwmx.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/wulimulironataw.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/wupugezaniledapobatewuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+art+of+travel+book+pdfPDF 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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10492 bytes
SHA-256: 6304c74f1cfe3e794d17462d541b47b49e9ca764fa650eb31520c44ad2a7f31a
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 18064 bytes
SHA-256: edd5b8ac7d5443c9dea2a72f690a6c4327cd118bdd6592fdc55c6141a321e85b

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