Malicious PDF — malware analysis report

Static analysis result for SHA-256 33baeb549879be19…

MALICIOUS

PDF

82.7 KB Created: 2021-08-18 03:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c94bc941ad26fba019fcc00b23a42917 SHA-1: da942f7c9189d419ffeafd6f5a71a3b1209ff66c SHA-256: 33baeb549879be19d5ea1d9ddcaf4b13d529ea0fc9176f821b98d90179585af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.alex-vasilkov.ru/images/wisdom/file/walugaxabapiditulivarujo.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f99b92e4255---224552883.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814b75d8a3c---40884566686.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o9sjj8pe8te592vbjdoge9bta0/vekozapolipurapigaz.pdfIn PDF document text
    • https://kawanmto.info/contents//files/44164361990.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b8f595bb---pabobawuvomozujaboguw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/37873d20a2551f10846fde61a8cd7d0a/55602432798.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/modivamamevu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/2076360627.pdfIn PDF document text
    • http://palami.by/images/file/28524684882.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/fupegiwekewanu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/dopogosabunibesalo.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/73565351889.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/20140389e943a7073027db3aef4d9a2f/4885589289.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/besotuwisatake.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ed87c8a1975c5abda7145485acf6c216/kutuzejereraxuvunoze.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/27018105919.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/petibuximesapag.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/10815763406.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/30101063677.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/tawiluguwapotegepow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=libro+geografia+de+mexico+y+del+mundo+1+secundaria+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ecf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECF5 17488 bytes
SHA-256: 6b37ccb50423966933c983d171ed420e917ec2986cb56fb4c9cf6a946576256e
font_00_sfnt_off0000c11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11D 17392 bytes
SHA-256: bd7e4fac5294cf7c586406df26077d672fa74016400e1e75d144f47201bcdc81
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 11332 bytes
SHA-256: 1ec0597805b56258576b4e272d5c773144de3771854dc1c3b5895056863f2793

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