Malicious PDF — malware analysis report

Static analysis result for SHA-256 b905733a57de94f3…

MALICIOUS

PDF

106.1 KB Created: 2021-09-02 00:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7b30a183c269f84f65be0de23a11f5e SHA-1: 708e677c3b65a8444024286b5dbc02f2c79c885b SHA-256: b905733a57de94f30febbc507eb5ad701f0b7ad0d951267b4dafe9b29b26d0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://go2germany.ru/files/file/xegaditupa.pdf In PDF document text
    • http://septumdent.com/img/userfiles/files/18476883947.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/juwufirojefibopexetepe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074124cabbce---lofese.pdfIn PDF document text
    • http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9ed95fcb8---tukaj.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bc8147819c54ee22babd12edbe4dde8e/lizofamokafukope.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/5650680380.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/javikokoxi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06238d6d---vofivesozurimuzobinimuz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081972c83b9a---fakaduzuser.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/loniraxuvisizazene.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/67753815054.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/vapubemiwabexanar.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/86872542030.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/xedejexixeminodafap.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rtpsvt140g15v31vslncu0cuh3/8253710393.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/lorijerez.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/wororewafazozimidut.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rusijusukemokabofemulapid.pdfIn PDF document text
    • https://securitydm.com/slicice/file/repolinidekebunajasewa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e4895195888---xubaxewonipurufazozesad.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608666d3156dd---18226594829.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20957e34a68ba495be99c7a3df1839d8/61348086818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=shape+of+guard+cellsPDF 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_off00013905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 10780 bytes
SHA-256: c7ea0076a0e8f2ddf963641398c9a1d5c2ed42250e2c43f8935d5d18ac8792be
font_01_sfnt_off000151c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C3 19172 bytes
SHA-256: f467ea6f4c0013e7ee2c1bc63e5eb8865dcdaede4a76860a774d13b14ad07e83
font_02_sfnt_off000182c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1