Malicious PDF — malware analysis report

Static analysis result for SHA-256 71287ccda04f7875…

MALICIOUS

PDF

80.1 KB Created: 2021-04-28 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e526d7e4c2c42d1871641f8e706882d9 SHA-1: 8f3f325f22e730fb5f3cf3bf4dbe17f86f8516fe SHA-256: 71287ccda04f78755d80e6ff5dd80559b7a599b9d429132a235240a302fd82ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content or downloads. The presence of multiple external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ced47a7ee6e513bfe91457a91f863d8c/77266708201.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608653c2e2aeb---64580275105.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1a01c5f3---23031489655.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ac2e3db67bb9ed2beba6e5b3fba6b8e3/92997016574.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8bbef8f0---46274462218.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071950513799---95125131290.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca04538409---bonana.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/75cbae1efc5e44cf289e077f596bc0d4/fanifutu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f87273508---vusimogareguxosigawubid.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bamadarutixegajopegin.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160796d53c3e16---xokomirebo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072947da8bcc---tekisigaruguxakixas.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5b3a3b2aedaa8b4f07f770783136ddee/fupomukabazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=windows+10+version+1803+iso++freePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 3724 bytes
SHA-256: 61730e93da51cc2bb168f7f18f458241dbba9f667c70dc6c1b1b73a9baabdf28
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 5376 bytes
SHA-256: 67ef3303a0ca84516556affc1edd3ae8a8e82e9603fdf4db3bace25080f27ae9
font_02_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 14536 bytes
SHA-256: 1b89ff1fd3b0f34c30515712338eaf81998c151904900a4a6eeb631a5d2e9b3c
font_03_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16196 bytes
SHA-256: 36c49e962b432a5cacb0ef651bc2145a5db2bc394f74d1a94c4d748dae50e019

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