Malicious PDF — malware analysis report

Static analysis result for SHA-256 475651eacedbfd08…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf49f00de63b7d464bd12268d8c1f14d SHA-1: 08fd74a9eb01903edbeea0ee1ec48c57391f7697 SHA-256: 475651eacedbfd084f9dc08c7e637f023ee254ed609e57aa88866b7597dc766b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and other disposable hosting sites. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=suros+propedeutica+medica+pdf PDF link annotation
    • https://srmhospitalities.com/images/bulk_images/files/32464909059.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eef69acdd5---rijedubazixoguzobumumux.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/72001908637.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ddf5ab47---4121011991.pdfIn PDF document text
    • http://saydersan.com/firma/files/wefobufogolapipasup.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd24bf7e9---sadakenubinuduzekiximeden.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/72767355278.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/sozazekebelez.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a630f58376---20059804096.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260d6f61655---wesapuvesoxasugodizukow.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081007392265.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/81119002588.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/mabum.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/38941597104.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f693ec7c4---nudikujekowelep.pdfIn PDF document text
    • https://bloc-immo.com/images/10252760497.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90795b2d6---kokiligogazedurisi.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/94681102179.pdfIn PDF document text
    • http://cl-pub.com/files/files/7506137171.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/38513536155.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7527e56c8d---suzalefokisavafaxow.pdfIn PDF document text
    • http://iwishop.hu/file/tokonesi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd83b8e4cdc---66644642448.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dffba8a1a---33860954395.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65026531001.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/xajas.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_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 18100 bytes
SHA-256: 3b0db33a37a66d6a5455122167d53626f28c770a29a9bc2840e4cb61dd1b334f
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10808 bytes
SHA-256: 8301563692f31385e616eaa190825812c8f1ff2a5697b8b524be2a027ba8755e
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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