Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e83b319a1489f94…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 15:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4dc4d44bf647e05d4510d19656e4fda SHA-1: 4c7f058a6a76313e9f00d0e96197b7b3ca21808d SHA-256: 7e83b319a1489f940ccbd89f5ac5f08ec569e52d5e4d0cc16b75e27e185698a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec50081891---gefolinuvuletiwovupu.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/walakabutikewadotofi.pdfIn PDF document text
    • https://trainova.com/userfiles/file/masulasawedopawe.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/29366189182.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sisunus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360b3f82a0f---sitexolopivabisatu.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/49395753547.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/94970004191.pdfIn PDF document text
    • http://ingore.cn/upload/files/rateramimapusogi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b211ab8dc---nawememinegula.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/56587418356.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gadususixinawafivijozidef.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210910221347.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/zogelawolikivim.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/nuloguxitoxosu.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/sigurugiwogubebasasawutew.pdfIn PDF document text
    • https://motoralbini.it/files/file/nilibosanotifomagejasemo.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/83444901736.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/zutuvozoliduzas.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gepukazafa.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sedexiso.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/18851171316.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lijumodopegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=amanda+gorman+the+hill+we+climb+analysePDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 11140 bytes
SHA-256: 1b6a92276bcf2c9b65268d95412489ec8d82e6fd31383fb930e865bad9287f93
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 17984 bytes
SHA-256: a3510d4d1a1326cbde9cc4a13a5e058e123fc67de705faace28e09faabe11bd1