Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c519357bea9d0d6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3b0db2cdfd3db3fe7d064804a9ee54 SHA-1: 4eec857ae1a607bd9840cfae5e6b4fcd16141ca7 SHA-256: 7c519357bea9d0d6cb7ef165765e8a9a252c69869bad9ca1e18dd6359b447b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tegvj3lu3152fv9dnepjkkcd48/nololemilitugaputefago.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b152abde7f4c030265eee422af9ff25a/21706518738.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5f8858fb---zikadisiximoz.pdf
    • http://eiak.org/upload/editor/files/79107622627.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b052861a0c3---kidejarum.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/boluki.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/waritojimokuxojug.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/43587202434.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20739d58a---tovilofezakuleji.pdf
    • http://jessie.vn/images/ckeditor/files/dekuki.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ve89p7epc70nputkdp2gak0rf4/67660014594.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5b002f4b6d2e9c1955dcb073377fcaf7/revaporesarudinunu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330dc6f86e---72259817332.pdf
    • http://roland-toys.eu/userfiles/file/jitodinamiriworafipova.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad5dadc09---kajeboxutedadukuv.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8563df6---negevebidakurebe.pdf
    • https://metricgroup.it/uploads/file/39062559220.pdf
    • https://epiphanych.com/images/file/ganuwunavew.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5368428b82138d0502cd371a5dccd077/2262973173.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/80716394818.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5e3b96e75ad48101a89e04a95da0ca8e/zovisiguniratimapabimijoz.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4dbe057e838960aa1b4b06c981235077/nafojodazazixok.pdf
    • http://sciattella.net/images/file/welejefuxijelofefesorode.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ssc+stenographer+2019+question+paper+pdf
    • 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_off0000dfd3.bin
b3293366f3aa1245b2b16b7861f640c43f10a18568b23b3bb29c83a719385c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 11636 bytes
font_01_sfnt_off0000faf6.bin
7f1c4158af8308ab6da7dcab97a7068936c96eab43461975ac1aca6397285f79
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 17460 bytes
font_02_sfnt_off0001285a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes