Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a984b1a772efa5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 03:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7265e4638a48465ed3119d70235922d5 SHA-1: 3af4793410ff7ce1280af5fad62d5fd1fbafff5a SHA-256: 25a984b1a772efa54c13ef8f871ce697025d088404a3c684d5c52dd26f920e6a
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attack aimed at tricking the user into installing malicious software or granting unauthorized access. The presence of numerous URLs, including those hosted on compromised CMS uploads and disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://menu2uplus.com/images/file/savibisinelikevolezexod.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0897b6cc---98465705155.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/fomigifojovapowix.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/puwaxojat.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/27463517304.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/nopewukokafif.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/feluwepavuxafokufam.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c705b9a7b7---jinipavabed.pdfIn PDF document text
    • https://2winit.com/Files/files/dutulenawuzijolituzi.pdfIn PDF document text
    • http://www.polni.si/Images/files/47801606927.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/24909356731.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/40711586313.pdfIn PDF document text
    • http://glassick.com/userfiles/file/64572045135.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/34243702186.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/86911733784.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/33770842153.pdfIn PDF document text
    • https://people11people.gr/uploads/File/94261606470.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/kinegotun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16ec6e12adc5122312f54453c8fc6ab8/jijepokaxopiku.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/68017404923.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/96563544500.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/9937050944.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1c23d17d---53208145480.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465762e49d8---gapabusakigidu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/15105492513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+migrate+to+new+android+phonePDF 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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 17620 bytes
SHA-256: 733a9eccc110e33db8debd3c4fd778efcdb1a01e81cd85ba509c7be065476e78
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 10704 bytes
SHA-256: 524ebdce3b254e2d3d01244008967e46a1583655ce04693674dd5437d4c78fcd

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