Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc6d197c070cd5f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-30 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df9743cb6a4268ce4b5de844891ea93c SHA-1: 7a128cb9e3f3a206122620cd828d1a92d512421a SHA-256: 7dc6d197c070cd5fab8aead2572a6eae8b63f1fe79a01d663c7dc4d1a2894512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

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://ketchas.ru/uplcv?utm_term=how+are+mechanical+and+chemical+weathering+the+same PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/fa875cf3143799965a9ed06b1978060f/zijuvus.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fa8a2718032bbb040c2ba9795ff5f05c/fodolekedazusudaze.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/bajepomebutamefafa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3706ec64---gafag.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/lut3622d0ae3f1a3m99fofosla/bidedidexumil.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/ginabijufopajivagiwuwowuf.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xalujutajanidejof.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/valufopogukenoniti.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078128344e87---lezewerudiworo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7495dd1716---40678601644.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/50776167615.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/69306839700.pdfIn PDF document text
    • http://charivne.info/images/file/vuditunewuferifojubax.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cfd8a3325---sovimokilavitetalunobejuw.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930436e3de3---gifafivomakupuza.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pk9quv4lert2rcdmssmv54uov1/gojulafuwimubavebigisom.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/tisafeferir.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vexilotojolipiremoxin.pdfIn PDF document text
    • https://ghnservizi.com/file/41793298268.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b401918971---bumitawidozapefipi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe1fc367e---71386406339.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fexilipigawugow.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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 16276 bytes
SHA-256: 4e1896b9a58d68a46830c99875cc93112ce2d4d9fb9456ce56af2af17b3dda43
font_01_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 10896 bytes
SHA-256: c56a8abf5ceab4cebe72c0e4bd8f5045b7a2791bdb058a1a08c40c5e137cc3d7
font_02_sfnt_off00012f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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