Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f20a5cd58067d35…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 00:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 53ac68573d37333d9155a1e05a22f18b SHA-1: fab01e201d86a1434e516611f2de1336f40832bc SHA-256: 0f20a5cd58067d35fc7dff36cca34b496171595f08c8505af704b4054d07f2fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests the primary purpose is to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1ed06091575e982d897eb2a0a3e90a2d/faxaferafuseneroxa.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c59d995fc---voninoguxiper.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/43038084759.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/33838168970.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/reragesazodo.pdfIn PDF document text
    • https://codecs.roimages/file/87996201080.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a4743c46---gofiwamufobi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083c15add998---3920365253.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cb97efaf7b091aa7f837f5fe31123ec5/28793918118.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11223e91---96875219076.pdfIn PDF document text
    • http://szpk.hu/_user/file/87259052394.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lejavijopabakik.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lijeforewalagexetejebari.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sevopagepagisomuj.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nebefuladijuzedado.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0bl91p4gmt2u5en6cbk2h5md1/felinuvemo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7332d2d---nodulez.pdfIn PDF document text
    • http://mav-auto.ru/images/file/8847693786.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/12932859048.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa5b45207d580a7d44e898d93b62b8b/razeku.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bea17351965---43669673648.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/25487219af64a37294127d21f7049212/8431976379.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/nidudixuwirozavu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f1a8bf8fa80a3af6db602a31a4c9fb5f/budupeximabukoxuxavub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=blade+runner+discussion+questionsPDF 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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 17540 bytes
SHA-256: 67eac6b9b7e7c365d71cc6754106b17f76f79aa3fcd05c2161b2e129315a4c4b
font_01_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 10664 bytes
SHA-256: e52abd0eb1c0759053b08910e6b94c5f6a2856ac7b9db0a9b8b07959f0f75123