Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc84a18bf8b784e9…

MALICIOUS

PDF

145.4 KB Created: 2021-06-29 19:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 284b0a114a48ca70d989c03e6a749afa SHA-1: 8fcdb180bda36df2638b935d35ff5352b1cfdeb3 SHA-256: dc84a18bf8b784e9df56b106bb2d1ad8aa195d29ab3d76e8898b88448de73cda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://betalinktech.com/blmedia/file/81744498693.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2dec50f4daa74c7b9ab98ec76ba2a8d4/rutunedivowo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/gajuruz.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/97432611169.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb946523104---80347090109.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7f5fdba99899e33acfe00b85709dfbd5/65686135834.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/76851138153.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817db708182---981609504.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/15698542269.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/29070388626.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gukona.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758342461c3---zemodug.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/03865891ea5d9613966281c056b979e0/85582176098.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5e62c9835266cca1c2bc3cb88dbd53/99657013869.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/964a0f8afa1d99d8bf80d5b868f212a2/zoragematutisarevetobo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1995a82ff7---43961655815.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/86760735949.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e521ae17fe---86982292293.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nurus.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160825f9737a5e---52205401274.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pujukuzol.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160866f24d2a1a---29278208956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=science+courses+in+polytechnicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD8F 10600 bytes
SHA-256: c64df2b60526cb528bc37c072ac5b6bbbce2b9ddff07de94e058f997d0e59013
font_01_sfnt_off0001d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5B6 27628 bytes
SHA-256: d51a7a36d35cff97deac985a348c89151084f480503440836fdf8b9828c43867
font_02_sfnt_off00021699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21699 2252 bytes
SHA-256: f6b6681aadae91c8626d8e062555424720f77aa80cd3bed3fe27efe2a3b93247
font_03_sfnt_off0002208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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