Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da8a03280979534…

MALICIOUS

PDF

98.7 KB Created: 2021-06-27 14:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 202f7335da0de7bb5c9c153dc4aed7ab SHA-1: c7ff9b0cf80b38161c4b6a7d220e00bc06243f68 SHA-256: 7da8a032809795346f966f8681aa74313445495b0911e60f240fd6afd10298ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted from this sample, but the extensive use of external links indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://chcial.ru/uplcv?utm_term=high+pitched+cry+infant PDF link annotation
    • http://singlesync.com/userfiles/file/50716016800.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8918e8c98---87541092141.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/70182819842.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/97858288549.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160942066b1b43---63522803568.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/684e0908b420830825a8c0a733318879/bezoj.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/fodila.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/22386956153.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/da3680bc9808d921778939320b129c11/nuwexufoxofowuwuxumasuxu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/gotegowapefimedefukinovir.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096551909f22---1779666347.pdfIn PDF document text
    • http://bjjiffy.com/upload/29623597438.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/98613537761.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7446g487ff22nppt33pfhrtu40/nezorajoselokeri.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/87qs9uki0j7791ubg9jre5f244/43403680544.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb803b9c46---bumik.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ba3aaeba---xorusejazuwolam.pdfIn PDF document text
    • https://digireg.se/upload/jezigiwutupurajakolamede.pdfIn PDF document text
    • http://hotechike.com/files/files/konavow.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a225d28a9b4---datomamugifozukuzudoxi.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/pifeniviboxelerif.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/62dhu50h0qerkgigu698lcg196/domavetixu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/69594039356.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fbb004f2d32fd63a577a9a40a041a224/febuduxunixipipijumibuxox.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963938615e7---bipiripuf.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_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10672 bytes
SHA-256: d07eace1106aa3ac8c7e244f25540bb47d39fb667e5b0410a4b2e8988c23c629
font_01_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 17140 bytes
SHA-256: 816a4a7a337e3849b6addc472cfe51eeaf84b032a94165cc4a991210f87be1f0
font_02_sfnt_off00016555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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