Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa680c94e5e8191…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 06:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47fc45b454e4bdd5eb5f7a1eaf06a5ac SHA-1: c60bee6d97509e56347266258c6784e63d2d7a4b SHA-256: 8aa680c94e5e8191743b45f390e20a13b4a6065ec5a3375f90be61bb57a9b90a
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 contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely attempting to redirect users to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=comunidad+primitiva+esclavismo+feudalismo+capitalismo+y+socialismo+pdf PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5ee84571fb31d8a8e0051fc984201222/xusolevanetibugatejiniro.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/9k1g4blncjpho392jvrnhspni0/89962143246.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/navagexisifop.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899f27e6c5---95208837562.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8j4u267go227ec72tdcqft63m2/vawipumesoxorid.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c866e36a12---tifujulos.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161036fed9eb18---bimafunufokaju.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/eaf0f12eb35ddf7bf87e729287ee84fc/fitazosamagivir.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/funiwugijorewosaba.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/nemakilada.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c114ddb9e7a---pevelokizukepotadaribujug.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e72e2029c---xitile.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2559c690---fupilikaxugubazevo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///pozodugisumeluzupo.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210828_036860FED835800B.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/33a9effe5c0daa3f1561411bc2fb078c/pebiwilefuto.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/mevek.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99fb641e0---mukizesavunedeva.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cae12c028fe---rogesid.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/62860393487.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/genawawujimulagot.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/38378157551.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/pizovukepodefedekug.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/25058109459.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/wemiragusalen.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17520 bytes
SHA-256: 24329cfe65c5e3ec52104a2bf8a303ed583907405a3b4487f4b64a685886b60e
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 11092 bytes
SHA-256: c1f1efa2882549cfb51f38f34f9e10b6f9db73c8aff50a5f4da72e8e2fb48228

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