Malicious PDF — malware analysis report

Static analysis result for SHA-256 c272f5ca953d6c47…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 12:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73c309395c6fb27aa712c66a9823c334 SHA-1: 054b42f14aec3566492933c9246dab2e99ddb633 SHA-256: c272f5ca953d6c47554d98c20866a39b9dcf48448bf7ecfc69c50c6f3f244df2
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8c3c5fe7a794ff56240b7d9a1561808a/vekaguroratituwafevi.pdf In PDF document text
    • https://bahceneryaman.net/public/content-images/files/41661129311.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a25160f81f365fae3ca61cc223bace9e/zarorofifaravop.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/6340272406.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/17800724993.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/najajirexuvevu.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/xovifer.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725417a87d9---visamawaluzo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/mapib.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e38929f4---wogexezoxov.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mqj878pp22igvkcin7r3892fs2/wixavuvavupetu.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/90846251404.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d00a2a584c25c43f763016e2bdcd2635/47971796491.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fitazowiruzutojexa.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/apsmsjfqvkm9tsm6ago398i4i8/43826141917.pdfIn PDF document text
    • https://digireg.ru/upload/sudininal.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/febojosevidig.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd4d0cb8c---xiparozokupuwobe.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/12960363731.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a1cd4d86---nunipazoxux.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/43497972931.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7o992nr69u8l39eat5ll10jicm/narejige.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/pulazuxumibunefugolowa.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/lurewa.pdfIn PDF document text
    • https://masukpt2.com/contents//files/1991846575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=quality+assurance+and+managementPDF 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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 10864 bytes
SHA-256: d0611591160db95e038aba63b993990c777da49122627147aafae566c1bd483b
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 17000 bytes
SHA-256: 158809d265744dad88cfab8936aef8eb199b1bd54f994fc0350307df4799fcbb