Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28c65d40749d9a…

MALICIOUS

PDF

86.7 KB Created: 2021-08-09 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6102d8cc89ebf9c75f3e4282e7120a0e SHA-1: 932f90fe6c0ccabd3487b9d433a3cbe5eba1e12b SHA-256: 0a28c65d40749d9ae816f6ae79de0a2675d4eb242b57061490cca655384756c7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or serving malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=math+practice+set+for+competitive+exams+pdf+in+bengali PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4e5d69d5eadecff614803de98516d2b5/detotaf.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jf8sej2io5mpnjegh0uk2a8ou8/kedizipojuvevenuwakikupe.pdfIn PDF document text
    • http://regmac.net/userfiles/files/mufat.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/96339458649.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc6d46b76---wovejevanowikulibovove.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/45406321401.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fobox.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b21c811e0340d4b78f971e1400b9f639/bizetuxomebuzividi.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/bapemuzesewo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd969185aae---74071097154.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nezalutarikukubogabowala.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/wiwewu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071236db5407---53742728508.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/89744735100.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/72268779262.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b44d3720---87626121949.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol67umddg70uqh3mopru561hba/mupexukanexene.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/483ae13ef351e360e8fea23ae50600cc/buwaxegiwowotege.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160873bd86beed---65347237264.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1b7363a0cec687f34c24f80041cc3580/41380568921.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/luzurijixasik.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 17748 bytes
SHA-256: a72fabb13a805d376aa9f0610141be75911151c262ab7ba27128866c65e8d6af
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 11368 bytes
SHA-256: ef62ae142f08e8b3f87b91e645414f1c660423e2a2f0cd58489a7a6030a8072d
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16300 bytes
SHA-256: 50e994868b05e35ab70a25510fe449ff93b4a1219f8205bc97804615050bc36c
font_03_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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