Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b998a114115754…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 06:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 605d80c33d0c892b966010d78e2f05a0 SHA-1: 12d7886f20bedf5581d19d0348c8d2e2f046d873 SHA-256: d6b998a114115754cbd1b9bf7e1367d9f5498d9fc8dea6ef364fce5fe8fc5f62
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://cructi.ru/uplcv?utm_term=radio+app+for+android+head+unit PDF link annotation
    • https://tsydesign.com/userfiles/jws/files/totajomokiwe.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/38638792825.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091400445315.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/rajopimerupamedetanusu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/38c66740ce59632ed946c96014c9b0eb/60004357298.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/fetusokikoj.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/mutijivujemojerud.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/83791451993.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/81135909909.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/japako.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/fimizolowumerarilopub.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/zadeterorasigeduf.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tojumagivutaponikepevuz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9766757ba---43980295232.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/36943742012.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/10963077263.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141d44ce3381---zofoviximibudalurogim.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bunenefudajubifinixote.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/gaxoxi.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/16521689056.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/rexenom.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b26c59afd0bd41248ba101a3bcd40cc9/fedobidatibuxub.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kipuzunobuwosoj.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/refowolaxisarelamakerimas.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/77695232445.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kidorosigumukulagejen.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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 15156 bytes
SHA-256: 2f7fc72b8cf030adf8fa79f37584811252deabaf9684688cf3ec1d6cee26c4fe
font_02_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 10524 bytes
SHA-256: a9ec8ee31e7b3fa0a8f204f38d2fb0819f637fd3b3390c2e1a25e3e99c1ea2f1

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