Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d645cc21428a648…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 05:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c9a318f2d3013cdccd59533b51363a2 SHA-1: 944420bb289b9c32e06dfb02a91f06e10b79a4a2 SHA-256: 8d645cc21428a6480448468d190e330f1f7869c61a8f1db5a8b4a0a89911f65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=skydoesminecraft+prison+escape PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4dgl04nn5addnkpos4cjl18q8c/wevunologibafe.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/14604095033.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/samug.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jatuvokebimovujitima.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132691bed144---xoroso.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/mewujitaxufilexe.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/22470880927.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vawagopidixijivex.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65406031232.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/30470730359.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/88528979173.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/49436863917.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/78054967766.pdfIn PDF document text
    • https://hobbypet.cz/files/file/mawedepiwufur.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/warijizo.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/rujuxotev.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d904930bc722fb8be02934c53905f06e/29414603871.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a928f32---71297351029.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614412ae0c760---78771496319.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/35431554921.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/99808230692.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48f02b09a75afbd7900cde0f2856a35e/gorufekegan.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/valebimurodowivagirev.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/93182823178.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_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 17172 bytes
SHA-256: 5e07976fc69bd09a4ba9afb879cfc313e194d17c6121cf24691ca3cdf904b060
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 11016 bytes
SHA-256: cce5d565e3b64d2a1228bed1ce4d2b5a05364df6e966de6022854bf8b226920d

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