Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d3d111e4d22a1f…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 12:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40f22cdf202f9bf2f13dbd985546085d SHA-1: 716c738281dff696c4026448e8d98882f75f0bb8 SHA-256: 98d3d111e4d22a1f39da9cb54b23fc10347d0793b221f99bfae6cf6d89336e85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farms are common for delivering second-stage payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/635e98a983e59f1eb6308f292d9be0ab/nulokazidozivilekitotini.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f51202e834034fe546f223a8e9c68fa9/bosakobovinogawidinivur.pdf
    • http://bahattinburyan.com/userfiles/file/saxixixe.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b271b123b---vebapubonudarezemofu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b281899758---jolanodigunigufug.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/jawejum.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8edb1b565de3d33200dd43b79bab4c1c/32071423955.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbfc8ffa9a017562a8ae8030646bd241/semajiliwakuwototiwebovaw.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5punvl80tt5pq0ersn7tusd384/13173205867.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c2a5fe0---lejukugevakipe.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968756531b---81320795657.pdf
    • http://igabana.com/upfolder/e/files/20210618123419.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd71e4785a---28158743338.pdf
    • http://jongauger.com/ckfinder/userfiles/files/liwotadimobe.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15a765c52---pujubobumumivebuf.pdf
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/pagusu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43e49d7ef2---faxosoverokifor.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608072f1e7a0a---zumilejixa.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b3e2467dfd743565f5173eb7b400ebeb/somufur.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d04807096055b9e4fb228a43139ff839/kowemakikipegivevom.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/aoohsqh9eil1bi0lk9qfv7fvk7/43693865382.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/5uch3k8cb4bccbs5oe2stekjnq/64244821975.pdf
    • http://unsersohn.ch/images/file/27976630879.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bootstrap+fixed+header
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin
0c7d96e00234dbe3eb318a13ed122e3b4bdba7a8a74a858738196d170746c52f
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10600 bytes
font_01_sfnt_off00010563.bin
0178e799e2b2fe9e8e43389885b7ddf136b1080f873321001ada3e7a3a865808
pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 17504 bytes
font_02_sfnt_off000133d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D0 16792 bytes