Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34c095fdd9bc566…

MALICIOUS

PDF

86.6 KB Created: 2021-08-07 17:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43feef2500816995a8ced61b65b13019 SHA-1: 3274a56f6934a071cb508c94e101f21de3ede78c SHA-256: c34c095fdd9bc5667a5b8a56d78f0688d1444d9bb8aa5fe10ad9fcb834813a38
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://raczcsalad.hu/files/jofiwilefabuno.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/xevubopukum.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/7198792819.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/27295707991.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/983e8ca1224323f08e6bab34058ea131/83865115924.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0s1tsit7vlssjj5gmjjhg5sp01/44709364165.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/808592903.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b4ad7df9---22023551613.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15388765581.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/92299259990.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mg9r3554mohqiv7on57b2vu5p6/pumodoranabi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/genebasojefumilexofil.pdfIn PDF document text
    • http://distributoram.com/files/file/477964435.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160847e8556e42---61924997449.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/374002269a29534a15bd262565f99804/36210898422.pdfIn PDF document text
    • http://flexa.cz/docs/file/nusogoki.pdfIn PDF document text
    • http://vejwun.cz/images/padiliberezu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/077fd8eabe2d22629265ca847e28db38/12115569270.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/piwanura.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/16558650002.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/76055039692.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/47591711975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=partituras+de+piano+musica+cristianaPDF 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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 20100 bytes
SHA-256: 7ea7e7cf67f4780230a1d482c5e2f76d154b3a0b8fe32658c7d7ff61508a9a3c
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 10732 bytes
SHA-256: c0810cd1809698575d0200d1a8196224eb53c72a919bd9cdeaf9606dbf0538e4

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