Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac5586a3211ec02…

MALICIOUS

PDF

86.3 KB Created: 2021-08-10 18:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6b27d01cb95a59ef56f631e156156a7 SHA-1: 771e2379227424d3bc77b680160d5bb15482b0cd SHA-256: dac5586a3211ec029ebd3e24961db4f9d91a4d196a08b01a6903d5a538cd535a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery through these external links. The file's structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=what+is+the+best+air+fryer+cookbook PDF link annotation
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/91213868128.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa6972c72---gumilidavuwudegefil.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9a975514---togakawawenuje.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac00167b9---ruzamowivalurikujeberudun.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/37823913850.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609862f7994f8---nemazawotuzofalijefare.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vqvstqi68hkaj2flojvb9jhdg5/83727475479.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/89945462428.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c8a0cf6---lafujawesujoxujodime.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/57325808216.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/21225060201.pdfIn PDF document text
    • https://webmenuplus.com/images/file/90097484736.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1628197588.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/lijuwaxomixame.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68129958796.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/g3apraiecajgqgt3ftan2b1379/livoritoriredigiwuv.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/57073038169.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m29upk91o6qpnvf85h7db17d45/rabamidevi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5mn4jmftf00gv715pbq1fu9cu1/lixinigaxevuroxaxitigi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rktqnam09k8lvkqsi98tjnp8u7/mezogemufumegokavom.pdfIn PDF document text
    • http://aven.su/userfiles/file/97832482640.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b8300003---gidinifirerojajetisomuza.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wesapegupatezozujutana.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10624 bytes
SHA-256: 5d16a50594960a73aa2d109f50087d58026d11257d6715405121fca07f7e5058
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 17096 bytes
SHA-256: d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2

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