Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed7b5e3a6e6265…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 11:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1b494c9743c1f24e28794adc19b5e36 SHA-1: e044934b15b64edc8fb8a4472c62aacc59d1dbfa SHA-256: 91ed7b5e3a6e62652028ed70db41b0b5d0f366117d01940a9e95f607fde6bd59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=boruto+manga+online PDF link annotation
    • http://gsprojekt.eu/userfiles/files/59857791255.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zanuzi.pdfIn PDF document text
    • http://boldogelet.hu/media/lupoxujidux.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/lifemuvawe.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/wefadonavimibo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8247f6899259e9a5b2025746e40c55b7/32322352130.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/74480396339.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16140395f8d1fc---jerewewojiwi.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/80960108371.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/51993172518.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c29103d---82916173633.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/51400427080.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/l12brgi9g78igkkb915euur8v6/2936025272.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/togulukok.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/322811529.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xosid.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/tupako.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613720ab24158---fefab.pdfIn PDF document text
    • http://yuha.be/_files/file/liwipugexazemapowupasezev.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/9725416459.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/padaniwixagu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1a1ae13c---satexozotiz.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2nbj41n4erdbh7ntkubih21oh6/43531838732.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2b40e444055ce08a17cf2d0cceeee7e8/vekofod.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/89168336290.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_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 19076 bytes
SHA-256: c10221a49249daf04a93f907d3fbddf29adad6dc86c99ea2bbfb440f22251da6
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 10436 bytes
SHA-256: 0b453f48da218dad817ab985e443d4afc3974d52f2b852e5ec249add6083fa58
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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