Malicious PDF — malware analysis report

Static analysis result for SHA-256 843fcdaec486e860…

MALICIOUS

PDF

73.2 KB Created: 2021-10-12 14:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0564a8e4628aa6d84a767d71adc711ef SHA-1: 4a07f969a6cf40e7f848b34b3278baf6d049c29a SHA-256: 843fcdaec486e8604a11d98847c303c5627592706cc066b28d691bdf22626ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links, combined with heuristics indicating a 'link farm' and 'compromised CMS upload', suggests the primary goal is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=geometric+sequence+worksheet+doc PDF link annotation
    • https://rachelrom.com/rescontent/file/vuluwizedomafovegazi.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/38593419458.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/riwedazunafaroreso.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7d88f85a---gilapuzewu.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/56251689632.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a9848f6f8---sajinepuwovovitune.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/25781502311.pdfIn PDF document text
    • http://kesifveotesi.com/files/20015063422.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/23960422514.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/3392193345.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/98250843399.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021103125416703.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d952edfc309580c7ef173d3dd5f3a236/guzaxinelozodemaj.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/dinebodojavelemowat.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16163351f56c49---kibavewikelu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/81396586456.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/gadikoj.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/sejisatefuj.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/97578132597.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1691c0e65bf9b2d09d2351817bc0d2a2/zukefeso.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/35864931448.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20211002194602.pdfIn PDF document text
    • http://xn--b1afbmo0alc.xn--p1ai/ckfinder/userfiles/files/7917204566.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/45590395134.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/dusufu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/82202282391.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210918032209.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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 10892 bytes
SHA-256: f8797a2670bff8888e1ed02284522c4fbc1ce265987407181e9004f4e3c3f2ec
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16244 bytes
SHA-256: 7030143618085d8067da8c2a981a2d14b3df7b7bb7f1ee655baa9816181acd58
font_02_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.