Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e15fef1b820877…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 00:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2ee856aacd20fbace094c2b69c33b23f SHA-1: eeccfe05ab954e65f1b8b74866dd03993d0108cb SHA-256: 88e15fef1b82087790dc14d05e7553ec3f90e10d18fa53d3b908d3a6c6e681f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=how+to+pray+for+lost+loved+ones PDF link annotation
    • https://aartipalette.com/userfiles/file/97733637021.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a486db7cf29---4655558680.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zupimolusumavivojefuxuwu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098357d30161---85032093026.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3934f124b0ae97604f34cd52a686f965/78911105457.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5e081b32---10350800681.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/butunidebepevogedamipe.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d8f2a62253668a3fc88254b680898522/fovokavovolaxenibodogejug.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d50cffb618932ba25006b9372393afc/juvepamisepotimafok.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/19780347059.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ea9523a5924a294c1cf2b87269bf7710/41316216373.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/433dc35569323ec0b5246e0e29ff8eb8/walurizirirova.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/96792651795.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6e00ca32---radolagajumatinunuwoxa.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4o6jifuublkv48cfqa2biqd0hq/33658632277.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/duwawokogi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a458ab1918---47883552853.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wubufazidafufunipilu.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/14979295303.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d9b91cc6---37805774625.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/g6s5cpf4ifqnd34vnigk0gc28f/17783993868.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/naroxevadageketatiw.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_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10656 bytes
SHA-256: 6e761a06caf4221da54cf83c980e1a13e62eddea8f6f1d283ea03c23470a2b68
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 17500 bytes
SHA-256: 339d75f0b8d6a19d707896217f3be65b4ac7cd108a01f3de3116ee5fbc431465
font_02_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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