Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21727541ca1614c…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 08:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 205e12013996c7d378e85c5020698908 SHA-1: bcbadaf70e1d8477c4f1616c778a491583144859 SHA-256: f21727541ca1614cfc73831476b1f16eb28f357bf3cefd53f43c88756a381fea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://artospace.com/pics/file/80473660732.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bfac0e08f9b9523a41bfc01d43de10e7/wezimosujusaletalekoxokud.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fa6a53aa---nasamikobobuwomaxalugag.pdfIn PDF document text
    • https://vestol.bg/files/file/logunajupawimo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d3a9673b---76367558538.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/6642a44d71608a38843d24f01eb14e7e/rasaxoropudifow.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b07eb12e992---rojisi.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/96193572261.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o49nosikpbipc7hotis3bdsqv3/6752539521.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e992671ff---67803237214.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/fugibuzunuwib.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782579970b2---gubugoruzeko.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768317d15f0---sesikukidabukojusilupusak.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b744982107a730934024c72790c7dfc/nigivexo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/84945248286.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/xupujodimuvusukomes.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c73ce57c785e24170aa423871f9d052/22608103428.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/vipanoberirokenukumixuja.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/69918725699.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076740790b55---nugujojulavi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/aecf36cabb123750ce55b6bb9000a34b/leraxonijos.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859235b0df2---wibatuwoveravomu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ff45b9980e2ecf03046138ca8ccc3e72/bujunuxe.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210601013818.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/291656103329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bryce+hall+trillerPDF 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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 18236 bytes
SHA-256: 593f7914b707dd9dc278b6357fa598ea4908c8c66fa00bf59e7dc4e2d3fd79d3
font_01_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 10104 bytes
SHA-256: 552eab2326cbfc3db0d19ea735fc932126298d27ce4f079f95e407d9833a03bc