Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a1324538cd4885…

MALICIOUS

PDF

100.3 KB Created: 2021-08-06 22:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a5a0c37ed36f5569a4e47c238a1eca0 SHA-1: db8fab50ec57937e4355d1299fd39da916e95320 SHA-256: 37a1324538cd4885de0b71db7e5727c7a293b0f7a4be8f3f243ad0814babd911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's intended to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://goldenpoolandsauna.com/user_img/files/nivawuwo.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/81251628301.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/widapojozunavejiraxoreweg.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0a5d7b68---80249522424.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e237e7b7d---22301159137.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/fazavelubojeju.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/75105954367.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/44137131107.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/khcemtoqvsn8843nfc6erfhd6s/tajujuxe.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e9aaf2e3b7ad5fa30bd3153280c25282/namitimunaf.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rut2i4h1r2t8r20e42b90eh3an/gifudipomozow.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/60e768f029f00734d25e05b83ec79703/gogigiz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36820205690.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1aefde5eb---52993043241.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/11337845536.pdfIn PDF document text
    • http://islandpointfl.com/userimages/zifunad.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7ad4430a---43230018989.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/dufodipemojuvakelipi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210629005546.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4dt7f1t428up691q8e964tigvk/76950991696.pdfIn PDF document text
    • http://schubert-hh.de/image/file/nizukokodukosutumafi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b39fc83---nekitusaxanixomefuru.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/16920264720.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a1805a24223c93d1740aa35df8b95ecd/pubepupupozas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+much+are+native+american+artifacts+worthPDF 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_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 17876 bytes
SHA-256: e392d45b90f3c8ae3e1bfeaca3dd5dd7faaf9871116ce5874ca352c3a2d3e826
font_02_sfnt_off00016747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16747 10800 bytes
SHA-256: bfa9897698a962e7b73692d75530890129427ebca4ecd5cbb897ee7d28a0ea8e