Malicious PDF — malware analysis report

Static analysis result for SHA-256 a905afb4249b2a67…

MALICIOUS

PDF

103.8 KB Created: 2021-07-17 03:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a090729a7a8f1354165fb70042c70c7 SHA-1: aa3b952a6a1234a81ff43d35d717f5e28391b15b SHA-256: a905afb4249b2a674c5bbaf0583304577ba943fd16d0b770a1d8c93b19274071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. This suggests the document is designed to lure users to these compromised hosts, likely to download further malicious content or engage in phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae464a4c---62372128902.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f726f4f869e3f83a16c1aa6c536a8d08/koxujojepowixununu.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/64541603155.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d11f47556---pusazivemafur.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b6eb0e46---wutinakexubaloxus.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gebobijivubuzenipefo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a02a554241d5699616db09090ce17cee/saduvi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043010483155.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2105a6b6a---rofojoki.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b5b1c84a912fb07a16a13713242b25b4/10540199191.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/69378238979.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m6pl7omqa32s5eu24jh4ecqavn/gekovufojijarujamogow.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20ab32a32---55589342711.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3fc87e8ff8c1e56ba2163200d05f0519/lumilamaredezazowenajof.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d14f4f035---59595354124.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/90b6d7c61efc606eabf609d9e53f7547/82120846689.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d0e4db4e4b5c095e68239fb9171740f8/2308140189.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/badea38856f94560f025e115b20b163b/segew.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2a70ed4eb2b8d2def6c634510d162576/52026629065.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe82a061ad---17361822880.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/piforubeje.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/19197278920.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e7c5ca486f7c9ac8242326b4b868ed35/24393940770.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/78u0opqqnrvjk3238ljkrqvod5/lupukakuxejowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+gaussian+processesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_02_sfnt_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 18716 bytes
SHA-256: 34aadcad9dc20d1d9b341cc66664ffb496ac27db2164b172847be4163e31dd26
font_03_sfnt_off000178e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E2 10696 bytes
SHA-256: 60013a76bbcfd0af47b609ecc6446a8b2cbec8d476b119d1e4390ab2667bb4c7

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