Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1052fba9bc91cba…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 17:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8494d89cbceff3e7140cabf14a0d7362 SHA-1: f1dd0f577993f19605dfc1f7649a9a6b0efec025 SHA-256: e1052fba9bc91cba64692a56f318f06465e73bd129b8f8a9e5030ec7d09cfbe8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://limeitec.com/upfiles/editor/files/bebofuriguxepo.pdf In PDF document text
    • https://osakaav.com/userfiles/files/8311534755.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/33925320403.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/43500706119.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132819717246---6647267267.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32c75f060---76208047738.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamidirufawavi.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/moratiduvawudonewuvafawu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34891067165.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/potegitixabasitejo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09c5cf27c---gebuvaleroduwabowu.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/13828901520.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/zewapaxenoniset.pdfIn PDF document text
    • http://boldogelet.hu/media/8903983645.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138356b22b0e---964541196.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kamolepebosimobi.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/xuliv.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zevewetaniwuzigolozuxe.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/vazipuvi.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/64059528473.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/tifutujifewimagimafumeris.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wojeleluja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+get+free+robux+2020PDF 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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10708 bytes
SHA-256: d76f4353dfcc0a4362b1f63d512bb3ccd13ea0e756547682678df9aa9ff7e396
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 18184 bytes
SHA-256: d2fc7dbc16fee9d7a23a74120e706493869efd60252b71f07ce0b727aa038b0d