Malicious PDF — malware analysis report

Static analysis result for SHA-256 840042209e760231…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b828b92e8ec037722d53347cd9b4c213 SHA-1: a30e5d7a9b53406bcbf80e360e6c9347cc92f6e4 SHA-256: 840042209e7602312c0aae99472fe2087214ae40aa748039e119a47c826eb209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://paolacaone.eu/userfiles/files/befulexetasowaso.pdf In PDF document text
    • http://dogable.de/userfiles/file/56891252674.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613581a14e395---xexusoraxari.pdfIn PDF document text
    • http://healthywithhart.com/res/file/75338431577.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614648ddb6fa1---zupowalojevo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/46671341027.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/84916253980.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/ridovumuseditonuwoxo.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/86081816082.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/7433507695.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kokoz.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/41185673064.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/remosa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/wubozejubesabifokuk.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rb34879aqv7im6i62nh3j8krl5/69010844093.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/15130143463.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/21191000023.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/3814272522.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/20635514470.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/pikepip.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/vuvalufilikexulijowor.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/jupavatosumapinozotetimor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=get+auto+likes+on+instagramPDF 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_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10684 bytes
SHA-256: 56d8bb584b9e86bb691669ae188cadafcdd67d46a343607b51505769b7b8a3d0
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 18284 bytes
SHA-256: 1475ccb1797b009eda5bba1e8ea7a61a87a5fe8f0965e535e57963989a81f75c
font_02_sfnt_off00013b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1