Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98d4438082e6afa…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8bc990ac4d4bcd6dac3bf9146e596dae SHA-1: d5964218f72816dbaccd17d787eec94208c8dc54 SHA-256: d98d4438082e6afa766987411e54c8d76a676dfd06de480c351246c98856c163
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised CMS upload storage and disposable hosting, forming a link farm. These links, disguised as movie downloads, likely lead to the download of a second-stage payload, as suggested by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078756f8c8de---47764796017.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb30416734---88808525388.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/xuduvolelobezapogonewem.pdfIn PDF document text
    • https://edbcagliari.it/file/33840274002.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/03afac08735ebea5aac91e9de5ec2db6/xuzekenurusonifategomi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ko2h2fbcjb0cask69d250qs594/movirozimejizu.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kapuza.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bujobuxibe.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b78464f5d---nuxotewu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tovixigopa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65cba2809a---61109330107.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28765936b7---tizojagiwokikinal.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/14223440239.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/41608833579.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7aaf219eeaab6c70d35a0fba5ceeb80b/35036831437.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7a848249---guduwedewokoxif.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/43223099232.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bpkg6m6k0qt106hneqbuipef30/bofefaru.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e9da54cfc6f1a71d30c56b6e1dec5e6/68609021708.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae560b58e---4914822616.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3ski0ff0e1k9qi4h0hi371k461/41533053128.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/79367991498.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/22096212081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+covenant+2+movie+download+in+tamilPDF 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_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 17132 bytes
SHA-256: 189e8ae1586871f2411d5480b8c1e5a4c0edb440bd548d241c62e68d1b25d62c
font_02_sfnt_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 10600 bytes
SHA-256: 22240e23ef70b1bb91ae528a894a0dee4d3809e930caae728c64e22dac63357f