Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7d70515f46fcf2…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 23:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8bf6e2d462da7877ba344d2b6b9d841e SHA-1: 843769eced6d54d7da4ae3da9131cf65843727fb SHA-256: 8e7d70515f46fcf2d79ec110ab8ec9b0705ee4b998d716ca288a05def9f2736c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on disposable domains or compromised CMS uploads. The presence of numerous PDF link farm heuristics and the ML classification strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://taigesw.com/upload/files/34041135092.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/29512629784.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sigazitegugavamotisufufin.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a775c20b27---wekunir.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/54103921771.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/pusurutaseraka.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59454ab867d5a12360e887c26fcb28a0/xedubabaraxonop.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-01-44-18-97.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6c814ada74310657c30c1088f1211070/14419828501.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/zobolemuzakimibi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sogejisukezorukapo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/tinisodasuxegixu.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/gotakutav.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xonetaturovewero.pdfIn PDF document text
    • http://bluebossa.pl/files/file/buzasewevi.pdfIn PDF document text
    • http://electric-kernbichler.at/suditaborom.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/9064424679.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/tefekinenitude.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303602e6b92---76230458593.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/zififipipakuxutam.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6d3b1cd7---zofemogula.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wowaronama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bulk+keyword+checkerPDF 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_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10288 bytes
SHA-256: a44dd48c8b8aaa6bad22b1dd2c6c906e478752a97454adb6c2fdee1bf4ec2d27
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18644 bytes
SHA-256: 36eb4c94d6a2ff72f9ac258b03b1d2f999f71da07a74338e1c8d8600774b9bc5

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