Malicious PDF — malware analysis report

Static analysis result for SHA-256 db998bdc330729da…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 02:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cad74bfa26377015834fa73518ca440 SHA-1: fb8fdeebfa34e6286994525a4c3eb0303829d720 SHA-256: db998bdc330729daa4d232c2db00eee24fc606f43fb46ba7af333f6686f93449
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.channeloflove.com/ckfinder/userfiles/files/lumusimuk.pdf In PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tikixigolopir.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/piwobidovixotodemojero.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/63255197647.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/98937964868.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/55425814862.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fs0m7t6eagl809atmg2pntfq84/62412044280.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/83559535110.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a246b08477---73391151264.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/65236019650.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f22e67635fda329a2ebc584eb7f7e829/26569992652.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/94550949250.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xazeviwenutudinazoru.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jubanowasupe.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/46202395634.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/81670717201.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_8F9F23B093522C49.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffe933eb1---93729188006.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/13325830636.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/podumofe.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/mugesimi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/69179553430.pdfIn PDF document text
    • https://vientangluc.com/upload/files/1026806581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=battle+destruction+mod+apkPDF 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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10920 bytes
SHA-256: bd06b65d63ad50c18e261639b957133bb6514c858dc1acf8a91e82574af284fc
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 18236 bytes
SHA-256: e8b638f5bbcff1654d3fc384667955325a3cf0a8a23071887a2fce00b4f20ad2