Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b7f7cde7e9ed2a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 08:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a67f171bcb45ff11a6306d963053952 SHA-1: 09db63787c1a2d891cc81c4d198fcd3a404d92dd SHA-256: f7b7f7cde7e9ed2ab3dc0ef1867f621df3de49a6f3ad28ab4beb9090e1c44452
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection attempt. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate an effort to obscure the final destination and potentially improve search engine visibility for malicious links.

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 https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/de9de22f664a04a8cf1c39a83f59d08c/94084480727.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bavejibatabamaborinif.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/faluj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zelugonutoreri.pdfIn PDF document text
    • http://planbmedia.hu/files/jiborukujekazakovukatiker.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/notawogadebosidosedek.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49df4c1db022af873e3e80da4201a230/lotezelu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/24726968587.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1b168a03---9364243302.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f59e3571---54013121031.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/vixuxizig.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137899a7ca2c---12082082186.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5lfm1975lr69ma0jtn3e9850h4/verezisataw.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44640497571.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/2137177759.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/13244255535.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e0f7767b---wifupinevasaxozupufu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1e988a0c396c5a40853263a7cfd5e145/jodofise.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/545aa647742259cea104461c89863bbd/gepepopiwade.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/sowuk.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3ed1f2468a6dc2d398422581e31341bb/22279913641.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/27207050688.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1b38299af9d886b6076880e49e5edbb7/wogivodetixoxabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7dc557d95---bipopitezidog.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da972efb51---73938566061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=digitalisierungsindex+mittelstand+pdfPDF 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 18664 bytes
SHA-256: dfe54f43f93209b6b6a2dbb4875ffa7024c79bba70664521848030659ad09f10
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 10924 bytes
SHA-256: a2fd0acc41def38f553846132518b453ae5064ac81a4778097b4e73cc59df0da

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