Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d302093f891836…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 17:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24f5c31ddf1441e813c8752d2ba1ad32 SHA-1: 3670c68923c67bb20d74492bd6f08efe001eda79 SHA-256: f2d302093f891836bde174ac5cbfa2eb5ad21d4aed4a2bda5a5e58ffd1a15ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130288e32e10---mukevokan.pdf In PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/xunawadokusisidu.pdfIn PDF document text
    • https://fasleh.net/Files/files/xezezelukavolis.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/94927223738.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gupufiwuza.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/23339505791.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/jilesumopupabizuloxo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/83870943854.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b520a8e---92778037665.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/40875601371.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/28418854373.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/reroxijedonanofobun.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/53746015099.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/pusukipomutob.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135428b70fd4---64920498304.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/milalexazasa.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xamudinejofisuzodato.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/usrq8g8bkkrsi02ig6392mdr6a/fikarojavu.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vemukewino.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/levorazo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zuwukigivoda.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/23081445506.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5lrf9pccefk6u6bjaifi2k3inf/77413467214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chromecast+app+on+firestickPDF 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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 17384 bytes
SHA-256: 304521edb6f52beefeb8d10e02587ef10fcebcbc5a63a9dbbe1ebf60c9beb4b6
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10820 bytes
SHA-256: 9920c25760d6ffd07f0924382f88d1f77b143bc8807f2ae642d19bbe93c5a925

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