Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b9a7e9d4eec63f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 23:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d37828959079503c0a56627968be2805 SHA-1: 7e741722dd5c788c2a28efce5da407a294f9ecb8 SHA-256: e4b9a7e9d4eec63f66132c344867e0aaa7320e398cb965b05e953a086809f24e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links aligns with the Spearphishing Attachment technique, as the document itself is likely delivered via email to lure users into clicking these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=what+is+amt+transmission+in+cars PDF link annotation
    • http://techhssilverbuffs.com/clients/61416/File/lekakoruxivilumagaxijupi.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/gimisukonuxogabotitup.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/66034749850.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/36455909630.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5ddb903ffa4b1b2f50a83c3070607f54/51513993915.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b72141743665511bbf5d2ce4a22b30e3/53109224502.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871bc5ea76e---29538841804.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/99138820707.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/85037273588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9c08479ca---2358292364.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nowefamozam.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/tuzekimuzelubipu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a61836fbbc8032446782fedd2435e7c6/mazifobagofanoro.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/7465808939.pdfIn PDF document text
    • http://attlas.center/userfiles/file/99014987380.pdfIn PDF document text
    • http://canadanur.com/resimler/files/77230373152.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/bipivin.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608248d762b6f---lokibuxap.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bozomegi.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/67244102666.pdfIn PDF document text
    • https://defaico.com/d/files/pevusam.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/76803717110.pdfIn PDF document text
    • http://zerosquareonline.com/file/wujepimazarimete.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be000bbd2fa---68413716222.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/fekagutumivatatige.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d7a4386c---gifoxagariteva.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_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 17320 bytes
SHA-256: 00934d7cb6662007fac85182e6dacdf38db74b4e2ec5790da4e70c4efbf2652e
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 10308 bytes
SHA-256: c4fe9ea98896f23b1cd0eb014ee44e9b4581f7669c9c319474588926e77cb159

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