Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaacf092f627796e…

MALICIOUS

PDF

138.4 KB Created: 2021-07-03 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9e2ce486f17ca186467c475e7f2fcff SHA-1: a5a870bc29c3fc3bffa5759515152a5015538e96 SHA-256: aaacf092f627796eb195afee4f5c4adc0ff09134733383a75fb0ec9a49151360
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, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb81561c5e---41059188334.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5664eeb9e4---11340909919.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7427d63f4---bavivapoxirubupexifileb.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/86116625111.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/59278544676.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a57a22b---delufituf.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5ee16e7ccd513debcf00d3a3e1a62c1e/biveziruxitusebutubasituf.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/82020460674.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/ce543109f706375f7b2914c41a3956fc/fibowapokevudomexogurad.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dtbq879rnur63g9f4su5rl0c3k/1304197890.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6539a2768ab693e8929eb06869a7955c/gifakewinobikepedujed.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/334897299.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0251d193aab7b5d559f80428dd7ecaa3/kunetevejeveziretosiga.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/7422049977.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/92956897794.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce730151ee---pilirixupalejijifedaro.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1b14a790---62106188078.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/8a9dfa5da35c57784ea7d9fd12c06bd4/dofabarirugiwuwi.pdfIn PDF document text
    • https://hirurgija.me//files/40181415361.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/62564724728.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b1ca0a7086fdf397c3097d3de3d0081/leginejavifebijij.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3335b611---96009481538.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/ruwutaj.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/enrqdbcdc5ik4kveaou8p64soi/dotitaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stomata+are+responsible+forPDF link annotation
    • 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_off0001ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA1B 19008 bytes
SHA-256: b11fffe93395f0a4ec05acb49928dd78b215fcf2c7d770155ab2fabb05d76153
font_01_sfnt_off0001eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBA7 10736 bytes
SHA-256: c19a419169b5913020dfc30a0aae9682f771b2ed8475246e885d6172305b3e12
font_02_sfnt_off0002040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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