Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e037d0c369e85…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43f1cce2bfd7e04ae4b1ff8ca2282397 SHA-1: bcdd1ffa01f24ac73a76d7ca2a8ce9ef563b9b3a SHA-256: ac0e037d0c369e8574b8418a25b4ab5e42a56757111d8833c4930ead5e0971ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of PDF-based attacks often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332516e3bcb---70554481871.pdf In PDF document text
    • http://knupress.com/pds/editor/file/bideweximijir.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nudikozagewiruw.pdfIn PDF document text
    • http://ave-france.com/pics/files/29216691135.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/34294953735.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/duluzopodowib.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/28458591538.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613631d92869d---59877272457.pdfIn PDF document text
    • http://baoveantam.info/upload/files/lavox.pdfIn PDF document text
    • http://safetruck.gr/images/file/74188167790.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/rawabuzi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/dowapuzukinorufozidilis.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/rupinuzesokedaje.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zikegenonumixax.pdfIn PDF document text
    • https://southafricapools.com/contents/files/15962736280.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/finepireveloni.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8092095379.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/dulitow.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139139399734---sigaxekofineb.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/wuxekez.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jikutimitiwiru.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/pozanepejufirubed.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/56565618575.pdfIn PDF document text
    • http://yuha.be/_files/file/vedeberosikori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=games+like+minecraft+free+no+downloadPDF 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_off0000bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 16076 bytes
SHA-256: 3f3088e422e4bdd7b50cd9a852ee5e631265b1f879b3462aeb2697f447434c72
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10856 bytes
SHA-256: 2ef5dd4f3e280367cee2018cb18d714b41fe5124f08f0dd7c30f0ebb7ab9f28a