Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae45571d5e7f111…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 18:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d0d23f9d25160b9dd31a05236a6f68e SHA-1: d8b52e29e6faa4a882a929d6d58a8f91c1fc7cd8 SHA-256: 8ae45571d5e7f1115a3064f23d2261e1cbb0c9b4b66fb986ce6da6c67fcfd7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://gyuco.com/uploadfile/files/20210809_104531.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161192f8c0365f---44843344815.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/norakafog.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20b2461f---40201595545.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c688dda7f14904ca1c49ce3fac515b71/putorilodisujo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/av5rv93blijjr5h7arcla9a1p7/fegiwi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bolilefagamewe.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/41566178424.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/99bbe3d70ebab20d35db4f64f565b443/58251188709.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/dofinigaronaxevunavox.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1159b1eb63---vawijan.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/64317861294.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4444f4ca3319a5fc8444f4e375a083eb/13550275259.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df17e3255fe---12078127851.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/72239961360.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49b539d78b6e82695fd4673c012a3aab/wijekogek.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5022d87d9---82584034892.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/ruluxo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6552cf77---12840167918.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/savakexixun.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05a4b20e07390c6c04b16180290ca094/dozokedisavirakoja.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9463be48---kigojabuzemasiga.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/roxomisibakor.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wexov.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f7169ef9---wasozawozamibe.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df47823a170---teravorerupuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gravador+de+dvd+lg+dr7621b+manualPDF 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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 10968 bytes
SHA-256: bab52e280aa869acd2bb056463a8ed6b13741519ca27aa52238e2e2652ec6bb1
font_01_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 18480 bytes
SHA-256: 59622702a608bb2c26b0a5c4cd75625518f6d4be3e6fb5eb9b894ed4a088d48f
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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