Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e839401eae2ee33…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b9f69356cee3f803c748c2e89798c76 SHA-1: e4cbc4d90623ad1ed72964b80e339377677d0011 SHA-256: 1e839401eae2ee33ea6f5e8a2e94648287bd5d977a2357b4ea9154d20fefe0fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ketchas.ru/uplcv?utm_term=android+samsung+star+2 PDF link annotation
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/zewavavalibadije.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/buwikiwizeden.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/lurulapururalokekef.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140378b1c420---jipupotenafezunexa.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/28625127608.pdfIn PDF document text
    • http://capri.lt/userfiles/files/lidelufojatekodikaj.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614020b2af50f---wedogazizejimejuta.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d9ade6d9e1fee791a3dbf6fe1aaf5532/8152382148.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/zejiduduri.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/noraluriwibipu.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/49637701963.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/rakuragoxuduwivewowekaj.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/nifiwavokajafojoza.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/44789675205.pdfIn PDF document text
    • http://budropol.de/Upload/file/75119236181.pdfIn PDF document text
    • https://www.confirmedtour.com/files/55187909609.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/xadeboxitidotojuzelirasu.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/soripofufemutadavapux.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/74233010130.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/bimasovelu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210912021355.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/lozilusovovus.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133554812f6c---figozabufavelezon.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kupelofazudub.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/90013332898.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_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 17864 bytes
SHA-256: 4f5fb9da49911c2351b7bd4c7e8e0afa07ecadb91b5fdc6605bdc6c779226e96
font_01_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 10612 bytes
SHA-256: d1266b5305e76e7a916c1653915fe0b62ac4b03a9232eec847026cec46a432c6
font_02_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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