Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2541b875396fc91…

MALICIOUS

PDF

80.8 KB Created: 2021-07-30 12:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bef56c3d5d1691ab0b2e7e2ff187238 SHA-1: 80b266a513e81f035fd9405fffd0b7f74b6d7845 SHA-256: f2541b875396fc918c3c946d8293d1bab723f285d75399f799ec1057f9121180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and was detected by ClamAV as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210615164511.pdf
    • http://hyundainhapkhau.net/upload/files/78768123089.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/fc6c88e0ee84917aa03106717a5a9e75/20234251312.pdf
    • https://wemservice.com/ckfinder/userfiles/files/94595509095.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jukekuzinikekofekeli.pdf
    • http://bestbuyfromindia.com/userfiles/file/balusajivonojoruzev.pdf
    • http://yogo110.com/userfiles/file/lafivon.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec4302bfb8---20989394598.pdf
    • http://robbes.nl/media/files/21717034619.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/cb9f9b656b4d2db310494efcc74926a9/22075638978.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b6e2e61257a4e830916b353e7062e37f/32296158808.pdf
    • http://azizolace.cz/images/file/35635680486.pdf
    • https://efnnma.org/files/file/26143184728.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fa787b3765e---95244018164.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077d066e0566---58917827724.pdf
    • http://sportingclubalbinia.eu/userfiles/files/27066735094.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a05194c2e91---wepoxapawigozuzojesojub.pdf
    • http://findusafranchise.com/files/files/42107949547.pdf
    • http://rhodeislandalpha.com/clients/56223/File/biboranagifew.pdf
    • http://anvlaw.com/userfiles/file/tepalebidaneseva.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pi33buq4j82b66pv5uhbt7atj5/wujixararimemotimufofizi.pdf
    • https://anjingliar.com/contents//files/rejutewaxomovomapiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=comcast+support+phone+number+1+800
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54d.bin
894ec96fae47579627ca0466436ff82e6e88d90d21a8475b626bcfdfe5197d76
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 11152 bytes
font_01_sfnt_off0000ef12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
font_02_sfnt_off00010724.bin
2a13ce22a14767744edc33d876b7ec9a14f9421549a07ee0f7b528e62f8e2bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 17308 bytes