Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea49ce4843000d9…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 12:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81725a4793b37a8bd3d0d2939e7fd52c SHA-1: 9174766d4699847c1b7307165c29366178a2698d SHA-256: 4ea49ce4843000d9b4e5b4c7ae5d22e151f4fa269ce8f9ba77ce2c648bbfd5ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=parshat+bo+commentary PDF link annotation
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/jokanedomejugopopemevubi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/89fdd0340d1bdfab9d4d442859d34880/gajuk.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160904df12a8bf---60709287538.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/88582888443.pdfIn PDF document text
    • http://zold-kommando.hu/files/sekefalege.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lelazemet.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210628070255.pdfIn PDF document text
    • http://ligneus.hu/upload/file/9928744967.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/98766470425.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843518df4fa---sijixisiw.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/livaxuzizemelakabilerig.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/saveruw.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/dafedunufibu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71uim477kg252jna0gfn43luj3/zaxavowumejesuvolotos.pdfIn PDF document text
    • http://skomi.ru/img/files/file/11360129039.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977f858568---95887253722.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/34rhucc8ss415urrqidbvhbclv/nagolijofujosinomoza.pdfIn PDF document text
    • http://minipit.com/data/files/92904532051.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2da77840b---tafedelutixasizo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vubogutizikora.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96302084110.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sirijukuzobig.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b1976605716554886c295def7e23c3a/sidutorujijonowe.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/puvafukevo.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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 20652 bytes
SHA-256: b43dcae53752f517e1155e2cadbbadf856a0934f3ab2e85e8adae929ea976eda
font_01_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001475a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 10612 bytes
SHA-256: d4846002e9e8d608382a3fdc02d1d9981e77194fef35f6be8a392821eb393b98

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