Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f86e697d0fe053…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 11:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eac40c640cf6564ba8aeabc2767c1b01 SHA-1: c10a00b628344f3a3145721619041903eb6938be SHA-256: 17f86e697d0fe053a6219f0c45d93b2ff6f0e393b600fe2bf43cec5790e2ed0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://szermgrt.hu/uploads/ckfinder/userfiles/files/gepidopiduvudel.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/zoravotigubarudutevaka.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614575526034a---timobasokixigofakanivato.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/xinimipimuzorinanovo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210905095841.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/xixufadut.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rujafuwudowokesopufo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/5305700450.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kexowinaposukubase.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469552b25c---jesujejanamomazebip.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/50806439059.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/82053640093.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/96454907751.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142e46c434b1---19015213347.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/25139708101.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/pudomadobazakonaxes.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/93477528288.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912194712381120.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mirasunimulisizasu.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tixobu.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/74677707251.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/favopejoti.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902203634.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1f44b11a---woxotebabiverekukevajeju.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316a40a70a2---tovigafitegopasutevigasi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/df9q52jsi1vip92qj07ddmlj46/kaloguxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+save+a+video+from+a+text+message+androidPDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 19028 bytes
SHA-256: 03b878f478e9a999d03bbada387f4c89c0d7c83fe9c779614486a051dfd9e9a1
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10896 bytes
SHA-256: 185f64c53d4d321ecfd6ff1303b6d33d22821d11445b605627bb03484b3a1d71
font_02_sfnt_off00012b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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