Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae0c45081d5e832…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 04:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e494718e5dde32c872bdf48de82a10f SHA-1: 440d9d098c3da1e580e361f93c246852ea2b1b4f SHA-256: 7ae0c45081d5e8321e164a0f06326871ece8d75d811e89df1d06881a096404d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of the attack pattern.

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://esvigo.com/upload/files/kogesowenezugaxufusen.pdf In PDF document text
    • https://peterdegendt.be/file/wijexola.pdfIn PDF document text
    • https://n-tlg.com/files/file/suvaluj.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bodewepirawis.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/jebizikegitumixafowejaru.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c719f4ce669feca2d2249b9610467482/penatojunaforosuv.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/2368428965.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/lizibirajawatok.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/13c695c3f5f5a7a49d7a6f3ebd6b6530/96380656756.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/jebasewapoxefobojibuxor.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nefezidobupebabivajewebaj.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/vonetopodomozisefova.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f995e8089---falapisarifukinatigovewor.pdfIn PDF document text
    • http://savemaxint.com/files/file/19520703141.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/61830326310.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/95548696313.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/pexudijejafalodoz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/7491j9r254jg6m6mk1me7334jc/fasusubifid.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161417a2cedc40---zikurun.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/xafafarunivogalovenu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315b07077ca---57299415274.pdfIn PDF document text
    • http://sjhtractor.com/d/files/fuvuwokutozeponozowadil.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wiguk.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/78727663593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=examples+of+pull+and+push+factorsPDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 17096 bytes
SHA-256: 43df6148ef6cef963402ebe56285c52791dae4d57c55d14377a7d10787519f40
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10976 bytes
SHA-256: 4df7fe1452efe40948fb444cf583fb939498d202083af770b660d32c682e6204

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