Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1683ff42bd1842…

MALICIOUS

PDF

97.8 KB Created: 2021-09-06 03:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eafbad262a728cc2a68f2340b774851 SHA-1: 40d36b4cf64f5eeb16e567702dccbbbf91cbe6a6 SHA-256: 3e1683ff42bd1842ec5832e0cfc944aa340ec910428c192f3a588522e8ef6150
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content distribution scheme. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://ngocvietbungalow.com/upload/files/kimifovewizirofasalo.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bede13aee---64507452974.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d1e11cc52db8971dc9e95924ebf64997/76230306867.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/25891944478.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/mijuvemutofiravetozas.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/timozowoletipebumimax.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c37156c0c7038762b694a833107dfb4f/31056863080.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16073584088729---72913123589.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4fc7cd6c413af87b28849f6327b933e2/bimafovemexo.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210612_A2C7CFAF18C82B63.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/xojoresufaxapelidu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc55109c0---24890961233.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/62561913519.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9372abbc---benaxiramusudujuj.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/98048132121.pdfIn PDF document text
    • http://lu67.com/clients/50962/File/fulokepoxamopakofapak.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/38550159125.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ffe80f0d28f7cc0a4dc063b1d2fdade/xebonifexukab.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8e18a2fb8---zutoduzev.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9959c990f2---48853283571.pdfIn PDF document text
    • https://onlinendttraining.net/files/40951720340.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/loked.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/68613979900.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87ff86711---86820185817.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lahr823qh8rhpj7ighcftmkbdm/11244205378.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/86073964485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nota+novel+silir+daksina+tingkatan+5+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_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 19076 bytes
SHA-256: bd92b7fc23247cd0f187bf0a5bf4925a639b76e9d0d704a479d16150dd4bd5c9
font_01_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 10940 bytes
SHA-256: 22dd42bdaddcb3eb0659c25f66fe299aa8e84d5d5253686ed7c2612ea549da05
font_02_sfnt_off00016174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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