Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f4a84a232bd90…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 15:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 011733513da3527061347a4b1b252f25 SHA-1: c5d7748bed34ecad048074cfc0c2d66e18ae6a0c SHA-256: 3f3f4a84a232bd90da8bcfce56d277a8e669611c42a8353962c96ebc0fa0672b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially compromised websites. The presence of multiple links to PDF files hosted on various domains indicates a coordinated effort to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=infinite+money+glitch+gta+5+online PDF link annotation
    • https://subarini.ro/mm/file/difolakukaw.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12547361033.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/76171968712.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358269f958---wizogopiwekosasumupi.pdfIn PDF document text
    • http://greenglobepms.com/uploads/27935222398.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/zulego.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/56307323446.pdfIn PDF document text
    • http://wjcopy.com/upload/files/tenowozeriw.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/zonijuxifasemajepapobud.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/701931790.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a4362b3b---vamogozat.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/32235165119.pdfIn PDF document text
    • https://greenways.at/userfiles/file/16917041449.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/75561755007.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/lakigasojizefuvu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/12242167474.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5cbbafb6---26882778758.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/66567325176.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/wexetibojesizixize.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b9f34575---2483003849.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/saziviwapiwixiraruk.pdfIn PDF document text
    • https://clickbox.ro/images/file/sufebuxeseg.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/51873723976.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081229056221.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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10712 bytes
SHA-256: 1def85c9f992647c117c0307f1df6593107df9c559f46d811ca1b82bc8ef3d73
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 17620 bytes
SHA-256: ba942ffa6ca4bdb1a7b8d609072cb4c4b3e999d780cbade184608527bcb615be

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