Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a20dc01dc5ec5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 06:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eafc0a627a4dcd8ee8950710c22f6d2d SHA-1: f7fd778c97bcf75d019e4d8e67ef7a9e7a44c3e0 SHA-256: ce3a20dc01dc5ec51d3cc14dbd5a7e6f617531cc4bf35005f6739f7c4cb1fea3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, 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 an attempt to distribute further malicious content or phish users. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://winhazel.com/indigo/ckfinder/userfiles/files/rorozin.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304089976b---36852845134.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/fenomuluruvufulo.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ragavotudu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904025324895385.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/44226934724.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/68770108147.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/vufixoruxukawoxuzogisu.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/76852908615.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/zabikuto.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/946458396.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/81484294224.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/midaxejerugijuvisabo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6b4756e9---kiduzonekewikas.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/51758066889.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/98518230157.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/wivivetenamuxus.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/2130408646.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/varazafanolabanokabofogi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/goiortul9cc01ir75kfns4ljk7/pefaronipumotukizudawar.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/tofonoduxukidamarefegibot.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/7907873366.pdfIn PDF document text
    • http://umhouses.com/uploads/files/13826016329.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/92850949706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mi+box+s+price+in+pakistanPDF 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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 17824 bytes
SHA-256: 37f5a007a93dd37f70575140b0fd2d4fe3c94cbecd6f3ce803b835d8811ec84b
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 10648 bytes
SHA-256: 6f3845101fecdb314fb9641ad01b8f4863d4de51278f9ce6a1425c70febc1e1d

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