Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e68fd7b81dfc69…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 20:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd8be98e73f659f99e78d05257d13f5d SHA-1: 78d8f4155c1374db776958ac1f916d9661de4b3f SHA-256: 83e68fd7b81dfc69fd99732c8cb5923f897360ed8615fa8798f1388d74b4521d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=henry+fuseli%27s+1781+painting+the+nightmare PDF link annotation
    • http://titadoorbinhduong.com/upload/files/kikavavitazobeseberolug.pdfIn PDF document text
    • http://thaide.org/userfiles/file/87236040230.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/34965730120.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/pezekesasewu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0b904192b9891f10c81b609b78965127/2737692174.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ccm12c9p8i3k2m41b676dso5u7/buxaba.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c7073e73---86848809961.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210818135141167.pdfIn PDF document text
    • https://manenshop.com/upload/files/98020731890.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/tasazosimodezori.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a97afa423fe644d135161475b843a2e1/56955541420.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3egsdk3ha6q9v5ml44ldsmsr8s/78894354332.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/fexixedadefiripaxeme.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96f7a2d13---58252494181.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vibifumujilasiliteniwide.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/71796850289.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/musif.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/21618775246.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/5676072682.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/3030951614.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/dulenepetegale.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720a643a004---fomas.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/68815250390.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/381c965885a6cdce9d3788733d0277f0/zufedupaw.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 19156 bytes
SHA-256: 2baeef9b7166dd88b665b1490450d48ab7f3964d8ee7a9ef0708ff9c59db5bc5
font_01_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 11236 bytes
SHA-256: 755121b61263265a37ad34956a1163822984045413f156d9b7429e07d7fca0ca
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1