Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac0a075c24022a0…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 18:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc88c3fc670475dfcaefb1d51c0791b0 SHA-1: 2f15a112043f278d60265e9cb4608002f1bb5a9e SHA-256: 8ac0a075c24022a04c6c704fea23de8490502d40053aa091e9d5ad3fb2cdf945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are likely used to host phishing pages or distribute further malware. The presence of multiple external URIs and link farm heuristics indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://kardelendalgicpompa.com/uploadfiles/file/serafituvanibawizapimel.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4e3968c176d741495c26b6146f27f092/66018990010.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0cd7c80b851c2c2e46e7bc3df19304d3/97882002375.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d41e9b84---kuvoje.pdf
    • https://theshamrockpublecco.it/file/46779614114.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c1a6369ef---sufigi.pdf
    • http://cbwmd.com/uploads/Files/74226592548.pdf
    • http://arablift.net/userfiles/file/kusozosevon.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3afee28104---49610941007.pdf
    • http://architects-desk.com/uploadsfile/61039231264.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/466bfd54fd1d98b44f2b76c532eae7c0/lixutasanomebifuzis.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/crv4s1ok12qdcqi9mmbksusoi4/49326228630.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5478270bd2---23478015792.pdf
    • http://alpha-cp.com/userfiles/file/fuvisiwolumuwe.pdf
    • http://ypdtools.com/ckfinder/images_store/files/79236054817.pdf
    • http://ahxxzx.com/userfiles/202105/file/tuxuwalefutu.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daca20000---93575319145.pdf
    • http://splogservice.ru/content/file/34142811864.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6d67b18e---95699909057.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/xuxotenetezefaboz.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa6umiksbapoefv4ou4dbpfd4f/wuleduvufukeso.pdf
    • https://minegociomiweb.com/userfiles/file/24168985412.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/58cqkh1b79qahm7c30sln1f423/27717943443.pdf
    • http://www.annaleehuber.com/content_files/file/64908121827.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d4e42c40ebd88bfe66d802b1ec103422/medufoxujifojosufisedug.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fc98f3db---nuxuvodozilawoxex.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/snfgoohcik9706q0oldi5rs6ls/80381900282.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+say+a+closing+prayer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ca.bin
e83d84055eb33278020ff89eac148e240a6d7d574a7a8120e1304bf6230cb915
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17272 bytes
font_01_sfnt_off00011dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16792 bytes
font_02_sfnt_off00013612.bin
50620fad3601459352d98895a3684667c5b797e0feac573585fa5ee24ed6b71d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 10740 bytes