Malicious PDF — malware analysis report

Static analysis result for SHA-256 29647f50c992cb4b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4d06384706403aba7705cd7ba1d28c5 SHA-1: d8f633c4c2c2406a50b2213a716e8b3b088ba9fd SHA-256: 29647f50c992cb4b177e10d16124b9b40cdb4d2ba623ace5a64c0ba3373c29df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://boilerservis.ru/uploads/files/mugovomasurevilolefejufi.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/27200883961.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/jijonibegigexisodipaj.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f42a01f879a3d917db9ed4eae206edea/31795969333.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9bd32d13---51822174708.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21b46ec11---fadutumitom.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/vuter.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/7255632381.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/mixapiroxiw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160948440a2da4---17013664655.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/46430403426.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6e024d699---47396173615.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/45867514301.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b8f2307b45b9795ee9cd87361577f10b/6515488616.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/37503224107.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fm87c1iarljeo3pj13au2u0ar2/43972269143.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa09c56b32---sukukedepisiwuxawoninoge.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b60ac20feee515c914d5e65e75cd0b77/pozototexowidogegomid.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5aec0e57---xubesufosebimifu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/09c248b5cfc03311acb821fb031414b9/jodor.pdfIn PDF document text
    • http://drironcat.com/images/file/35606531654.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c634c608eb08f88c5f2c2b57af1c9a0a/24597231343.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947719ce41f---93703085487.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dc57ffb52953f22dd21224e47587d722/kijenilasezewosejalew.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/jafoguwakujomelotamexowoj.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/15568473382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=allen+study+material+pdf+for+iit+jee+freePDF 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 10984 bytes
SHA-256: d8a179dd2425c5b2d797d8b72775a589619c7c9cf67c75a6354d0c473dca9add
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16976 bytes
SHA-256: 06ad41f19ec8716da1f42e70e7b794f01a8796cd5d42dd52b86b3151ec36322b