Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a891f3aa2b388c…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 06:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667cb26150eeeafa7c41792c723a62dc SHA-1: 5d02e5396c8c3944ec4e3310af6fc04e7c21cebe SHA-256: 05a891f3aa2b388c60a90d53f3475ccf23eb1ed87ed909020572a55ec2f7be0d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d102906c---95770038270.pdf
    • https://xanbiente.de/userfiles/file/40681896974.pdf
    • http://vogiantinhmach.com/media/ftp/file/12855350886.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b88de4220---15488731161.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9a69ccb1---lebififujozikolomovuw.pdf
    • http://alphasigmaoverseas.com/userfiles/file/pubizusale.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/o047ts659v3mdiem0k4mo3t076/voritujewovo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4416ce99f4---68913601796.pdf
    • https://ktmcollege.org/public_html/userfiles/file/62453537375.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8e68c5ef41dd9aefd05608aee561c9c6/temejitivifiziwet.pdf
    • https://walkandsmile.com/userfiles/file/75840035934.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34a33f086d6c307dcbbef453bf2438ba/38250768345.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/18321987352.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/68642521477.pdf
    • http://4bzsoftware.com/Images_upload/files/fomiri.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c86f6b8cd287a7ad698039f29aec8a62/tefafamudagisovi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a633af62ef6---37649672295.pdf
    • http://shinies.ru/img/lib/file/wuridukisejatexobe.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3342e18d---juribu.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/papivuvekipebaxaligiwaj.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d055a274---49100912652.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d54d67923f2c3800ac7ed9f56548758d/93037502596.pdf
    • https://arerp.kr/data/file///28942407587.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sb0e5scmk72ooe7s9d6rj6aa0k/fomimuzapoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=not+renewing+contract
    • 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_off0000ede4.bin
cc87bc80f06ba5205159939c9b7ec9ae4c39663f7314796ecd73bcdf5583254e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16396 bytes
font_01_sfnt_off00011875.bin
30b8dba19fbf228f066ccea040c67b157922f476521bd55b8811a8abf6aa99a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 10252 bytes
font_02_sfnt_off00012fbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes