Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d45377c3c57e1de…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 01:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fae30ec8649fd12c37039411dc2fc20 SHA-1: b503a8844cb12e2d5adf01819df295b848461fa1 SHA-256: 4d45377c3c57e1decdd9c991ae4225d87c4754af7df9044fbb6d78ebc18442cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=convert+unit+rates+worksheet+7th+grade
    • http://vanxuantravel.com/upload/files/fagasena.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2fe55cba0---fetozevuwozuj.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/15f315504a25d0fecc571c00ad74b694/zozugi.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/216d40ee4c96415dc7d43f281b6c8246/mamip.pdf
    • http://atek-ent.com/upload/file/kodudizutelof.pdf
    • http://morecoredesign.com/images/imageUps/files/fumunarabibodujax.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/divorapubumekebafis.pdf
    • http://szyqjsj.com/UploadFile/file/20210816164848366.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126214240b84---bebisadetixudanamilitelik.pdf
    • https://namhunglogistic.vn/site/files/wakasanafapap.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5ad5d603643ed7c88cbfbdb0cfab29f4/14005828947.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16077c01e9eeee---gakodobojexogoj.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd1ad2918---kokapusedopewulaw.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e407f334---fofesitufuxasilof.pdf
    • http://aarogyamedico.com/userfiles/file/64528326466.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/eokqmuogb2r12sl16phel8i5u7/32799786156.pdf
    • http://kolaykanal.com/userfiles/files/19199868808.pdf
    • http://songhandiban.com/uploadfile/file/2021080408153173499.pdf
    • http://loveperfectionschool.com/upload/file/somal.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a9ac1ba3---lemisel.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4330b9c6fd4b9f83bfd81d7b0970e2f7/vuxifabewufuwamubuvosi.pdf
    • http://assytekservizi.com/userfiles/files/23608860491.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127ebcf862---kapodejipagemarizomofegol.pdf
    • http://turnyras.lt/Files/file/judiloguwobojokifivep.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/221d723f45e03cd65c9aab7e8700e812/23718330296.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c480.bin
b086f8466ecc37308287e9d13d3353c23fe95155fa8d43f14b62b864e2a75b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16816 bytes
font_01_sfnt_off0000ef57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
font_02_sfnt_off0001076e.bin
12a3f48ac98a03eb784be355bad678ba488722bc77c65f7e12c8083d2e3bf98a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10904 bytes