Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a4018726ec0645…

MALICIOUS

PDF

111.6 KB Created: 2021-09-01 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c5298bb726c9624d382c2cac7b94a1 SHA-1: 4076911aa48e60b2e217c2b1daf0beec203fcec3 SHA-256: e1a4018726ec0645342b334534e3b09fff5ce3b9b580180390427491adf7bb87
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be hosting a link farm that directs users to potentially malicious content on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071cecd7bc---ritureruvem.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vue0b9cfebdqg4vh0jo71ckkv4/minegipadezipojilixene.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9uinnjb271ech7hual7sb0f1c6/nugazovivusij.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fabfb3a30---47448927280.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kekipenabuzumuzajiva.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68hfjc8upn21omdl0i0n9vq5sa/funumenuvajetunutig.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/72601035795.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/wuwegoguja.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/21420703250.pdfIn PDF document text
    • http://garderoba.sk/images/_file/84896730777.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/wanazibijerole.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/uvpasftth27668bac6nekgnp09/zafiju.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/livumenekivoji.pdfIn PDF document text
    • http://www.heksan.com.pl/file/bamilajo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jusuruviwodikasifuparato.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/99023729425.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fezipo.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/xokarugelebanebaro.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jerirofemodaxiwufawapa.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/be52561916a70dc47c87873585bb01f8/geluzevitelor.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b545235b---rabupekepegisejiri.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/rigemo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/26698236618.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/40618981623.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/457211f1a55eabb6ea8a6d999043aa82/6034211215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=causes+of+river+meandering+pdfPDF 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_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 20056 bytes
SHA-256: b6a6bc643b04530f51a03575d735def58aa1341eda121aa16289b76f3c6c8bc5
font_01_sfnt_off00017e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E61 10892 bytes
SHA-256: d62681a4d9b77ecccd1b16781f550617a41a07821ed8b883bafd009ec0819d55
font_02_sfnt_off0001975b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1975B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1