Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0d84888f64e221…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 13:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fb45b87b9ea63e14a99dc2eed044e59 SHA-1: dc33bbb76913a05bde9800199012a1b4efd304a3 SHA-256: 7d0d84888f64e221b36cd0faf390546868afc2f792fbc474c99baeabbdd7c24a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160780ce6bf12c---muwupofuvigakeve.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8e3e1b9d27158dcc374ca43ba5e2b1b7/84868451474.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/48566084957.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/10090875966.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sedojasebodozufalejexi.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/sabolapaxobaxon.pdfIn PDF document text
    • https://menu2uplus.com/images/file/4962872129.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fumavuxarizevujuferewe.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/pixepadirogeti.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7d4d0ce96a4f5050bb08d4c1e07b91e/gobuwagono.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445103a032---19769536229.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f9258877064635a26b19c9a12db04ca/pofojud.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/25066352061.pdfIn PDF document text
    • https://renetravel.ro/images/files/12365692801.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9kfmdn9sd0oetquk0c9223d16o/vupirarabizida.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/giberuk.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/a5trpqrispe3u4naajmnqkv7i2/93965984617.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc93923be---vikavurezezabobuluvagu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/67098067409.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/bf480f4f721bc63c89fe1686b0e3af22/jagifusigokizewaxa.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-9/20210709113353573342.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/daxuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+multifractal+walk+down+wall+street+pdfPDF 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 19448 bytes
SHA-256: 0221003232a304d658f86231f9bba93082227a218a19c37f565884ea53640abd
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 11040 bytes
SHA-256: 269ad18a240b5dcc4fc23042c4f2122a6e5a53363351b4b41bcf8935278a21bb

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