Malicious PDF — malware analysis report

Static analysis result for SHA-256 0458b60740cb07f7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 03:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b09f130f93c1deadd1a8396f94d9598 SHA-1: 6ca5d5809565f6a4126bdf279088d3654b699548 SHA-256: 0458b60740cb07f7bfa0bf071b55badc381b8afbb8e69d36313152806749e88b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF structure and link farm behavior are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=adb+sideload+stock+rom PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95d3b2009---fosenaje.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/mijitagiboxewa.pdfIn PDF document text
    • http://ustunongel.com/image/files/fokupituvuto.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130e891b275d---xetikapavunawig.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/vulixit.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/93217581514.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/82335626410.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/fikilosewekonifab.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/60044629067.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pizubizenarefomex.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vezuxodesikunavutawe.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/49855753027.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/kiripovinumoxakep.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/lazuputarosaniruvavununu.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/44158290997.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa8d59387---wasobuvuku.pdfIn PDF document text
    • http://bscartridge.com/pic/xasuvoniruduzeroweso.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pawewukumuf.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/44510279435.pdfIn PDF document text
    • https://kiptep.ru/file/43764317980.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614637c617d21---95005803553.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/zunisitar.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_off0000b795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB795 16204 bytes
SHA-256: b5742e66c83ab9aa6102ee180b48b58347089d5600d72c6d5368a94cb2458a0e
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 10640 bytes
SHA-256: 42cfc73ea6612b5d775662ce027df915496e66e91ca7bf60b37c8d0c205fe491
font_02_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1