Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fb1eb5e94c2b50…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 13:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0c44d3c0e9b7675a1b197c5b0bc9ad8 SHA-1: fd2af2fc769b6353c1183199baf2dfef11dbfcc5 SHA-256: 95fb1eb5e94c2b50b0bdf0fff3d910491e8ab2ac4d38d3ed9f9d2a56d3ffb1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a significant number of embedded URLs, many of which point to websites utilizing CMS upload functionality, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbd3c2b14---6557923804.pdf In PDF document text
    • http://soles2walk.com/data/file/31631181997.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gipinis.pdfIn PDF document text
    • http://budropol.de/Upload/file/44009169943.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/megirufefifalomupev.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/89258404591.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144bdc04f55f---84237109455.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/32752900473.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/mexotufu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dif7fksifrmvnvddr40tuaasb6/mojap.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/41511750150.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sutijesas.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/xezunitisemoxanu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303cbc120fe---192315846.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906034518.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/41188640091.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/63068207944.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fg1p6piumriklca1qokdh97pc4/noluvisapodawa.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/wibiduganapamizes.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/53403098837.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141925c14750---siduzijibezivo.pdfIn PDF document text
    • http://schokofontaene.de/idata/kuvagenogolopalaxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aplikasi+untuk+membuat+video+animasi+di+androidPDF 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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 15596 bytes
SHA-256: 38cc96ea2f8b1a3ad35134aebb67f4d9243efc0c632cbf0883b9a2954ec13cf8
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 10932 bytes
SHA-256: 04bbe706be345eeaf57685452f6367379713ae67f8089d07e8eee83941fcb4b1