Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eec2a79599f565b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-06 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fae8664b807f05f35be167187278397a SHA-1: 3e15a98c0d439fdb80f10a20e7446f7d33b9afb9 SHA-256: 7eec2a79599f565b3c3e497d83c81f6bf5aab6848797ef3343c090c6f9dac463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM rules suggests an attempt to leverage search engine optimization and compromised web infrastructure for malicious distribution. No scripts were extracted, but the overall pattern points to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=protein+synthesis+transcription+and+translation+worksheet+answers PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7642777d0f47c78db6be99ec2f3269f9/80698978821.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/431704c49d7e552f4b42b9299ebe9166/43040034590.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l074qpc6i4fjv63ss9nbu04l90/5499540943.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610d75b0826f3---96047017988.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/28244252986.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/67862630533.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c5214ed5---laziwusubi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/tulilarobodusuxuso.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107052252571635.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606035237.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e189d5c4b3---dotujanotiziz.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6412a56---wotabek.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/lawikulomuw.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zadukojiximaxigaju.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/27029265886.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xukurebodejop.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/salenidiwasajisevalofu.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/34297408064.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/16953762882.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8920bc548d070b21decd859335da9713/1872412022.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mefofabamir.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/wekujuzubopazod.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eabde5b6e307b04fcb4c3a24a5689468/22246089203.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/91ad75795a85fed42067e24f40d9530b/37079208531.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081106131070554.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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10904 bytes
SHA-256: 93188e5cc11902dc3d0bc3c49ae3cf122bc6c13694187e856b9d798ec50350b1
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 14468 bytes
SHA-256: bc88fb8802dcf7f726c6ede3007b55863f5dc19e7bf210417130980ccfa8b0ed

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