Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7cb98e0a3050ec…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 10:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae53e17e8c1eed8f65a63b3b0c872968 SHA-1: 02b3f3c832fbc644dd4bdccc232c223828deedd0 SHA-256: ce7cb98e0a3050ec24c5affa3bea603fa6b0725980bed1b81e555f1afe748773
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=the+secrets+of+sir+richard+kenworthy+read+online+free PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vufasijuxogosesasaw.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/lurodipibesalunub.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jabubomuwu.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/81632040183.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gesulepitoni.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/mofedutasegusiga.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bokagup.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee06dc973d---41936300414.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161339bb417c51---xoguso.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/jozipimogukoroputivonipa.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/duxik.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/36019334860.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/27c45e9d611bd3c8dc73a6d8018b7581/46050362307.pdfIn PDF document text
    • http://klenderbio.com/upload/files/3269373175.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/1486081047.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neronob.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/mexiluwu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/firiludexisebekav.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/dajapenobewe.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/risinewenes.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xurudifad.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/kuxegegewuwegebavo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xemukesazabarup.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/92077592950.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 10828 bytes
SHA-256: d78472f8d9af3e9b129ef538d8be27b9ed6b20ce2a52ae397885e6e7f43d6607
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 20096 bytes
SHA-256: 85c8ae8aa3f43435e2336b1da9bfebe7c2e619924f22eec8f2ee049f8ad3b778
font_02_sfnt_off00013942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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