Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b6c013b53b9a4f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4b997ea47c3acb30797fb18c85c67e3 SHA-1: 46f3db1f764afced424dc80cb991169b2b0e1136 SHA-256: 30b6c013b53b9a4f96fe3f5425848b3dfa106ce17c37e373a36bf28469a8fd0b
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 external URIs, many of which point to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=install+ios+apps+on+android PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e65952d5d---92571694193.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/30647315495.pdfIn PDF document text
    • http://rayanchem.com/d/files/xaludaxagimimezopeni.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/sisekunotefomez.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/sifezuxenozi.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/zokuduwe.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/97573105169.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d08a8d49b---dumisiradapimenotid.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/45435682624.pdfIn PDF document text
    • https://jobtiara.com/files/files/kinejexoragopimiwomel.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/zijelilifabuwufugejusu.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pinavexatup.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/bakelitokajiwimex.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vs7dddj9csh6bkkeuvjsbqrg0s/51820272774.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/16869482582.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xosasopifepekiziwo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/89678244827.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/goxudofilomake.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/7737830442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f567ddc385---9839399977.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mm0j4greef0ir0iaamog6s2cep/davozawimujogidukupebi.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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10204 bytes
SHA-256: a401fadbb9f58a9ff9763a14569fffbea851a6972c14c4d90b1cb1b5ea5265bc
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 18860 bytes
SHA-256: fc928b0474277b859bafafeada5954c547b53ceeedefe3b89033ea9d9bec64c0