Malicious PDF — malware analysis report

Static analysis result for SHA-256 2918b929e4ccbc16…

MALICIOUS

PDF

133.6 KB Created: 2021-08-23 16:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c26ae87564307380750bfcbebd1c16d7 SHA-1: 99aee0826e41664e15a035bdcbd9005b53bf167c SHA-256: 2918b929e4ccbc1679ebe9b89b8329d3cad158c765d411aaa2cf687148429400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains a link farm pointing to multiple distinct hosts, many of which are likely compromised WordPress sites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

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://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/luzedizafedituvorij.pdf In PDF document text
    • http://cycling-software.com/files/file/31468638421.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a383b74aca8---48430164408.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/rejeruxawagunawaz.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce213dc107---91761767635.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a305aace210---pedibawefefamu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092f05857ce5---jujabilugepibiwezixopadoz.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210815192421_cGFuYXZlemFtbw==.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wulalabagalotizubalanage.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vagim.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e0fkkn677asi03rgtosm1q0vjn/detikenok.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/xuxapabapaze.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/jovomapajak.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63c6ac2422a09c52dd8494517ca2264e/mofoga.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1mrd130d1j32mmfgnniab4rti6/46731931219.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2s9r6l335ha48r93jl3uvrn92n/57265690212.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nebonadivajab.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/52610193645.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/tarafipirupimekapudivate.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/sageruvitagu.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-17/images/files/pomutulaveveto.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/71a1274c5b46a53a4da1a3169f646efb/jepubape.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/fovot.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/wugafomilivumolekunogu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a0051cc1e782e9f1b9eb22c72c6cfba5/piguw.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/45cae0bd0d5352a006e1a331ed381b52/rovuminividixuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=woolly+apple+aphid+life+cyclePDF 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_off0001aa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C28C 10356 bytes
SHA-256: d7fdd038cfb15b5887472dcc00a9d94197367e945a08887b3af119249d58c555
font_02_sfnt_off0001da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA09 17488 bytes
SHA-256: 91126ce945d998c602955db54cfac49a56221a607b784c50ebf55f491473db15