Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82e367c7d5ba5b8…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 09:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5da8f68aa9808dad842d65a384224848 SHA-1: 5a695288695236dcb6b2685d0ceae3687fe3929e SHA-256: d82e367c7d5ba5b8ec7056c3f4b4e8f5ffb1ed8e4bd770d7a2d7f2eafa42406d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=can+you+group+facetime+on+iphone PDF link annotation
    • http://lasfyy.com/uploadfile/file/20210913024925885.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mamalamokuvejobu.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/61356625370.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/dabuzofagalabigufetabarav.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xesiwokipobiremujuro.pdfIn PDF document text
    • http://vodnik48.ru/content/file/jedubutisonekeg.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1fb1239d3b9f2b8c706d5aa88d8f5bac/bosamem.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/41365848371.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/56049298589.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/koxogekejuluravovop.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/48273959527.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0b2c657f---wonijagumowapib.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417cedac27a---ganise.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f5c7b22f---wikexamajadasole.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/10602710790.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/mefefimakaravil.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/52698944395.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kr5726tdb0b16q14ul8sbf61t5/4243392602.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vevewesilitonemap.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c3c5be0ccdb0418686180bf2f1f1a5fd/60706268231.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/72828048191.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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 16836 bytes
SHA-256: 19b5a27387d060fdbf4cd3200e8fec0fa540c1de9c879093294b061964467f42
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 10960 bytes
SHA-256: ef1b96cbfa26150d0cd081f2d252475762309f400db3812e5beae7a148f151de
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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