Malicious PDF — malware analysis report

Static analysis result for SHA-256 90135ca23039f2e9…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 13:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b5801933087418a2b48cd5c9ce07465 SHA-1: 5fc3ef042e0d8e8458d541fa295a2e3683295255 SHA-256: 90135ca23039f2e90349e2de5c9d5a6d07a6faf011fb6fca72d585d3e168d3a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. These PDFs likely serve as lures to redirect users to malicious URLs, potentially for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=aiden+watch+dogs PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/aee8cf62dc66bc9d41a0cd1ac2f0fb71/90807807781.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97be87549d---50383192849.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/67181513172.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/35350004324.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/438f908a4d2360230799f58d4f5165fe/negigiliziwuwolog.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/k5vtp5osfolsr3bp681a2h4boe/92659112698.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a708ccb258e0df2752d4f9422402c8/13156862314.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/68437019768.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/de7ee3e0c9764a8a3872fa75149b245d/fatomikuxugupezofawo.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/lanobaza.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d35f22a47---41774980468.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430075938886375.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ae853bf70d878ceefa551abfe7ad091e/42436672977.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/19768918944.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/nomewozukoduvepix.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mi50f7ithin2hi6c8ogivgl17/24490391229.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f7a1754b---56792653624.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/1498315870.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0c9c6e24ef4adf2f390e8dd6b12de107/tawamalu.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/75200047338.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858779060d---79303120187.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zubusesonutavu.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_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10568 bytes
SHA-256: cdf86302c8fdedd1472c98733440d7ac4af7bd0ab42e6a7144b18760975e6359
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 29728 bytes
SHA-256: b8c76262e150e883b9a808cf0dcc8ffbcd4153ebd65f098a2271b185d344ec62
font_02_sfnt_off000153f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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