Malicious PDF — malware analysis report

Static analysis result for SHA-256 96441c973d5a1909…

MALICIOUS

PDF

83.5 KB Created: 2021-09-25 16:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b589a6bfd6ce369c790b1d956a75b7b SHA-1: 195f55608a646480ef7904bca826cad0078fe0a1 SHA-256: 96441c973d5a1909f845dd4b9ffa94b6d82fc592f9175c0e1b4d4d38658e49c8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terralis.eu/catalogue_dynamique/file/20790183883.pdf In PDF document text
    • https://felicityokolo.com/file/11952476098.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/puzumobeto.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dbb22afb4752c4f39ec02a72dac0969/pogoxogipufezibejod.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-19/20210919134244456530.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109182316466996.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95845505434.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/seraluzil.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/56787223578.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/01de375a17914ee0931823071b302831/59962389590.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/lowirifizilipavosajodidek.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/60244729431.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/vusozunifozadawuwit.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/95531674710.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613daade9d75f---jabiwekegajututufutoti.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/30359065815.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/87455028280.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/77116916603.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/94634247334.pdfIn PDF document text
    • https://netpage.info/userfiles/file/sogupobixerefetod.pdfIn PDF document text
    • http://deauville.ru/files/file/vojegaguvusaru.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/50187650497.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/52979973962.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/464850d38f3e20d0b92f5af327e16805/76525144697.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/loxokojegawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=playstation+2+roms+torrentPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10504 bytes
SHA-256: 798c7822b2ba92e4b8e05a03f617353a90069d840427b6c0135a5bc1c6635770
font_02_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 20712 bytes
SHA-256: 7a07a0e99c2285821db7695cb0575f81891e77a636763f406f50e3628f7c3dbc