Malicious PDF — malware analysis report

Static analysis result for SHA-256 8084589f7db898af…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c54774147f434142947701097c857b02 SHA-1: 4d6e3b7e2f8d923ee82fae69650192b21f7575c6 SHA-256: 8084589f7db898af2bd85eb5527fe89ef0bc69e77bbe2b1633978e388917e698
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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://tidurmalam2.com/contents/files/47791849050.pdf In PDF document text
    • http://www.santamyoga.be/images/file/wobunovibor.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/wedipivilelaborajibi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/94065380177.pdfIn PDF document text
    • http://jn-zhsc.com/upload/94470435070.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419de9e2e2---pujuselovotudawexubokoj.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/ninasuw.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wagofumazuv.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/55428060185.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/tudogo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365eae45ae5---miwonidoburedibapatu.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210903_6839ED51C2F52EF7.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/zasemixosojekofeluvet.pdfIn PDF document text
    • http://wdnederland.nl/file/sewitejuposituxipanumazir.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613836c8899cf---kekarijitesale.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xiwezovazivunavevojoresam.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/51112085873.pdfIn PDF document text
    • https://rafautama.com/uploads/file/felulazidezerasanifusi.pdfIn PDF document text
    • http://vo23.ru/upload/file/vatagib.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesef.pdfIn PDF document text
    • http://shophouse.info/images/files/xobolatefarolikotigebu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63143246737.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/modefovawa.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368910bc9e4---fufar.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/41505941018.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dbd97027---malitifom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pyar+bhari+shayariPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 21196 bytes
SHA-256: 041ff57221c2d0b7e55559a34b8ae60bcb5925010ddd7e94f92d8a52585e2a51
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 9960 bytes
SHA-256: 0003fb7e828b8cbe8ccfe2872987a0d5f79e1a88ae36cc58b5c25782cbb91c9a
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786
font_04_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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