Malicious PDF — malware analysis report

Static analysis result for SHA-256 246aa004e50b6d83…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 07:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a060d37e97232465f7df5916cb766791 SHA-1: 11c8045e0511ff34b706f61ef167fc9b0b218d1d SHA-256: 246aa004e50b6d83b70562147f95e4d9955c13d379fb474c0c911caaefe98e84
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves to redirect users to malicious content.

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://salvatoredivilio.it/userfiles/file/gifotojisex.pdf In PDF document text
    • https://easy2ticket.com/upload/files/satojabobividajapebuw.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/wimonogarasuwuxasadexex.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u2ss19g213juc01ck3sspolilv/6525273053.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/1ok2u44es2dfcfhd1fhb47hlkl/womamivogosomafepobebut.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f556c1512c5b7b607afa4e873454ad11/xidufipiroza.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859dbcc36b3---nanaxabofeje.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/54647932365.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/80980953129.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/sunewurasosijiwi.pdfIn PDF document text
    • http://pb-book.com/user_file/file/politidigajuvowuge.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81803265748.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6573c3897a115fcdfd2606f8241605ff/monekesutufekolujapod.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/xozodagusabujomujesa.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/fovema.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cea98c8f9---20002307081.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/49800530581.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/2358006372.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/nadezasumubidirelofim.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/3658677389.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/27420988956.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1a0cbdea0885a9fdead46035f33b94ef/kebudewelupu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c9ac2612266a9d36ca0c5dd25bbfc43/dilepujuxexavevexapizum.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/31940110232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=old+testament+bible+survey+pdfPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10984 bytes
SHA-256: 92f42db479e855b1ce3d25fd1c760af9b77df4f73f0eb7752d2d0cbca05ccbad
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 17232 bytes
SHA-256: b40fd4b991a29b8a0f5922ee9c63d89ec496eadd0d2d4066f9533106468b1534
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1