Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f0eb64ca871936…

MALICIOUS

PDF

89.9 KB Created: 2021-08-03 06:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1c85639d01b1beabbade7c831e99748d SHA-1: 79f5f6f92e2422e511877a8a8517051c8ac2f16a SHA-256: b5f0eb64ca8719360e3589b53d5c89053c97f35f3bafc5a6a4e5a20cd2779543
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc4c34a71e5---16062777931.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/54539827987.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/76c3388f66ad30cfcc8a8583e57053bf/luferodajuxobagos.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e2085d11---titoziburokiwefof.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/rewagusezonexoj.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/88237021016.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nepatozapubemofidap.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/87338526043.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/17776394185.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/72634739075.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/bureji.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/4f7lf2k0vb8p57qtvc5vflasj6/rakiwarizarunada.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4d76vb3nj9o6l525157pgc6pt7/lidowagixolewide.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/13926298177.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/d180jpn46l3numj8uvq5gcrgv4/sukaroranuwimiwuniwam.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/lazebororulezej.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vujenutipelasi.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16235805353341.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021661942106340.pdfIn PDF document text
    • http://chinahongji.com/d/files/jufogelapunugosoxaxefuxoj.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zadinijaxivezakatal.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/483113a2b425bed20bd062699fdd9e3f/mapekofedij.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/62mvkkc5c7gtrit7cvu0ngbrf3/zifowaxokegapozawetat.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/xumagewiduzazaxadebev.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210726070951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=installing+andersen+400+series+patio+doorPDF 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_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16596 bytes
SHA-256: ddaba2e4883669c3ca16da0d258ae865f9afccfc6062721f0704ea4aafdbfb9a
font_01_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 10716 bytes
SHA-256: f7ee509747f15e995231acc6d09403ca5b47d2d7619fef6d5a3e71ecefde2d99
font_02_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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