Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a4acbbe0e63947…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79ea6deaa45929a3913d95478b4183cc SHA-1: df440bf838f7ed7c1ffd5d6bf3833e7b8b23f3f0 SHA-256: 89a4acbbe0e639470ffc930d8bdc3f4640a89ae123bb2aec761f62b6f05a2f75
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and links indicates a broad distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ozkayalartrans.com/userfiles/file/kanoto.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b790c695347e37f79f80d5856e464065/1486103938.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bae7958b---13587294007.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078474eee892---bogosagubafimesovaxusi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/28647756447.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/32d1a6fb557c0666ba521317299bd1c4/zekawusaxexivakodenap.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863cabb9cdf---katoratojuvemokavoke.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2tji3g2g5kietai7brbvpc6m12/92174306581.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210527045050958.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sdetb53qqpjqialjkid83k2i77/kifopigapimutinowamal.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c87bb34a7f5b0eb2ab3d239cb6dacb08/moveda.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/68230327951.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210606_98F8B99D33319593.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g04u457etkvghfh74eumlm78q1/gesinawegululemi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b579431b05---tidowukivilutes.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/68d3ee0c2cd98a264d64c09b0634fbe7/lirigeselavudesitejex.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c98ff---pinapozazoja.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8c553fe205e78ce724046d224d0b509d/69059385046.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/42755639355.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f1f6c6f63cfafadb3d69798b53f894cc/12883502193.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/23260273307.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2b4h1l274iuolmjaifmgj9f4l1/67186753718.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/buvakoti.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b75ee84916a3a5240b85a71095eec43f/xugatumugimabifabipiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+protons+neutrons+and+electronsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ce13f4bf078f03abe8ead3a6d3b2c63/53362262968.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_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 17324 bytes
SHA-256: 4a2c6e34189badb3088b3ff983fe2ae8c484f94d8cc4b97a3d75ae5b4a4cd3a5
font_01_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 10772 bytes
SHA-256: 0374bf16b99ea9e475fc5a9a3120a402d6e5d79fe1c3eeede14bfbed4a8aad53

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