Malicious PDF — malware analysis report

Static analysis result for SHA-256 440862f317d87d77…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 09:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dac8e0ed6e1eb6306ebb363ff4501707 SHA-1: 4b406396bfbeee63adeb81069a0f5fd3fc972b1e SHA-256: 440862f317d87d779cf639a6e723e2e1a97bdc8fe31a1b03758c6816a22b9944
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several heuristics indicate it's a link farm hosted on disposable or compromised domains, pointing towards malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=from+the+grave+kresley+cole+pdf PDF link annotation
    • http://www.florentmaussion.net/userfiles/File/911742488.pdfIn PDF document text
    • https://inks.bg/userfiles/file/33253140740.pdfIn PDF document text
    • https://recrut.com/files/files/wimigolaxamelopifofebal.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/27722125750.pdfIn PDF document text
    • https://alohasafaris.com/files/wunotoxakaxekuse.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kawamukuritazodaligejuva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf6d4188---poraxamopisanovosumem.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49736313024.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7c4462c4---sizivulow.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kisovijexufuwupepevi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0ae6d1775dc6b7336be858f4f3a58407/lawubikibuxa.pdfIn PDF document text
    • https://kenadong.com/contents/files/bukofa.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zitigikitejepizipaliw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://riviera.az/userfiles/file/gisafobukogapuxojixujo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf2d0c466---50512925194.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/fopekerukiwapuso.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jepabelini.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/50859421092.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/laxiridis.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/vopirugovatozowin.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/72053751288.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/84000168.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_off0000aee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 14020 bytes
SHA-256: 31383d32f52094c7545634f33b2ce0dc4469fda1ff628f844b90941becd8d152
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 11120 bytes
SHA-256: eab6ebc2c658c8f6fc369f7f45016114dfa05febcaa56df03f5b696e87f9391f

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