Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aca11b95a64aae…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 08:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e32ae6ca753a83f36beead94132e409 SHA-1: e59cf4d055ebe19e0f847a39a2b1bd9631fb3c5e SHA-256: 28aca11b95a64aaefc47158b93abbe2f93a851b0bbb50e3cf4c26b1ae8e5fbde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a download button and numerous links to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the embedded URLs and heuristic findings point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=sukanya+sumangala+yojana+form+pdf+download PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d16b3db7f---jololesepofu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5803926bb---kisosesepuxotod.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/90271677439.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-9/20210809024836333519.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb12cd1e1---zoribezakurakevusor.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/zigesatibazilirazane.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pb2a2ldkdunrug9optu3qkcdp9/91462297839.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2414b5527f---22853552593.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2042edbfaf---67022242261.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd689176e1---14794643273.pdfIn PDF document text
    • http://sushi-belovo.ru/files/8701273023.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/90073765139.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/43ee9e3f6b052e48968e69e58871e232/tigokukurodevesalobobibek.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/11b04ed5a8be320d602325471e357fef/nobaliz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7e7649c9ca6d3e149c820d931260fc1c/56270751390.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wivowofelew.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210619152122992.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5c9a5b48---82079210550.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a314768ccb---bopugupitan.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gomipebunizidinogofawal.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/45397154837.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/xisekebojole.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/egqlb68pl302dekv52nq650563/rasigupotawevegawizolor.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/265536183f1ac9b3c87b175bc1ce9103/kosukulufopu.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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 11116 bytes
SHA-256: 35eb3368e965bb2ce0cbd028569e467b32d9aa792b2f3a1cc2bb930f06697fe9
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 21624 bytes
SHA-256: 30302e618c383b795f2ac60002b0fac53dd78a0d5004e03303c9b3a265814e5a

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