Malicious PDF — malware analysis report

Static analysis result for SHA-256 973680b00541e3b8…

MALICIOUS

PDF

74.1 KB Created: 2021-08-30 09:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8036cb2dc2d8dae56e0e558ec2a008cc SHA-1: 76d459250b36cba13e23ecdf957d7a628190ac0f SHA-256: 973680b00541e3b8a82a130763b20a3a0e17be29376ac8a49eed37e564d257ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=%24300+charitable+contribution+deduction+for+non+itemizers PDF link annotation
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a063d624b91---3707476973.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/lokozagitozawikak.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8ca21801bfe67937b9a43b1d73c893ae/78487101095.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105102154423445279h6mz0.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/55877981192.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/61433485385.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedda1aafa2---taperoloravun.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086952ae26fb---69359046211.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210822011152.pdfIn PDF document text
    • https://la-klamm.org/Files/files/disufubowepote.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/gozajotuvoboxif.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/29ed29b4931b7921f196a0c4ccc2afe6/6369622709.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/rogejexagatenazatelopep.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ea5d7c583---63632059093.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210630210047_v7owia.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/020148214381.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210830143049.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/59432524752.pdfIn PDF document text
    • http://labsshop.com/d/files/65991929107.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210710_1B8C510A475BD7BF.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4aplsdgkn6faefp91kf0h7pfan/90960109881.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082045e7cd18---16347174390.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/2404167041.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/va6uu1p6f5v215dcq4ieo4kf30/faxudidak.pdfIn PDF document text
    • 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_off0000bd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 16148 bytes
SHA-256: 5b182b4c6a896f60b189f9b97adaf1f85ebc5e2c8af0360532b9c4979bde752c
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 11448 bytes
SHA-256: c7f28be8a707e7f62062a2f782e4bbad2f7bbe47c11ec36097fe037383843c3f
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1