Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb3c3d5794434aa…

MALICIOUS

PDF

97.0 KB Created: 2021-09-07 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ebf4f4bb944d31be7272c719197e9e6 SHA-1: 2cd4047befb569097b1d41cb6641cd492736f6d6 SHA-256: eeb3c3d5794434aa89f46072b484f687d096ee840179fb92b9d3c8032450a16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm intended to redirect users. The presence of embedded URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://akgikorea.com/file_upload/fck_upfile/file/movaxek.pdf In PDF document text
    • http://asfalon.com/__files/file/sewirazobifi.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/58280615453.pdfIn PDF document text
    • http://p-energo.ru/content/file/57225326286.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44604b6b2c---87003028870.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jusabusofafuwupogopepib.pdfIn PDF document text
    • http://df-foundry.net/d/files/13797586639.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/69128047890.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8f1bf9371b22e1d7cb1e51f4b2bf1c89/rametejinaxeverapal.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444f5c571c---zamonutum.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9073b2cff---49558741736.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac5ce3cbe---fukuwexavepivewut.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d4716e23533---pozoruwatokomo.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/44697522605.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2a12b7gos61j9ncph2m43s0ugu/43634793955.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/37942128388.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41b19510a---16082021662.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rrk53s31e4jnmhokjbigd7vo1o/vesaletapadinikaj.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/59248827361.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/rifuwi.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/57610198728.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5qd4ijvfknrtdeg7kskej89kn8/79374639466.pdfIn PDF document text
    • http://museeducuir.org/upload/files/9941392716.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/799d2c29f399e37870e007dd091244a7/31921156737.pdfIn PDF document text
    • https://unitjaya.com/contents//files/273347594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=organic+poultry+farming+pdfPDF 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_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 18932 bytes
SHA-256: 4b306925b69a50bac334cafade599438bc35532f24e4dc32aad0a27c7e0f8769
font_02_sfnt_off00015d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D96 10904 bytes
SHA-256: b46372da1d5b8e954c0fb01f40311142d28b73952342a9df9ef644e52622616a