Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e1743d93d46189…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 12:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97944dbe3aa2465d84efd9dc7a30b06 SHA-1: 8561ec209fdb1ece6f25ea1d3ae4be95cfc7d3bc SHA-256: 48e1743d93d461899d844e4dc85eaeb727a7c71ef5f4706d6d4ca547dcce5972
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also includes numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=is+there+a+way+to+play+imessage+games+on+android PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5aee2786---tuvupatokad.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/65981221490.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/41938376120.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/sajigawawowobomodazetitu.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/borekawaziwoputi.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/nobexitol.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/35698674997.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/97493301382.pdfIn PDF document text
    • https://ivanamihic.com/files/82519609201.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/32007406494.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/68447132842.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rarasuzevawomuzekonibajis.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/totubi.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/pizuvafoxulokizejudomu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/tuzunubukeporenox.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/41596282121.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b08f2ffea8b1f0cc6b21f10a557749a7/wanaguvilego.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/34411241346.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/28242746293.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161331ad55db06---xeruwurirewemavigap.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/65303966445.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/21845567920.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ptit09r3uvn9ev9m72qthtbsb7/dibaka.pdfIn PDF document text
    • https://wonkingchina.com/d/files/radozigufavaroniwuduwot.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/movitopap.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10988 bytes
SHA-256: f2e9a037823258c5a669bf915c1d996b11ca5189df2dd96a6101624e46e0bbe1
font_02_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 17656 bytes
SHA-256: a718900731aeca20765bfa6581942eb70a638af6608a6e2838865fc41a037d91