Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad1caad03090e2e…

MALICIOUS

PDF

91.4 KB Created: 2021-09-13 14:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bd330418b28e79a4c5edc09bc986405 SHA-1: a75296dff3f775094543293e46db5764898b14c7 SHA-256: aad1caad03090e2ef4a14b345b172de8d3dbbb7bd0c5e738af808ad669968f62
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://servicepapik.ro/files/75211724776.pdf In PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/79884933665.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/563534848.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210912035528940.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/rafowujepuvixiratexivawo.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jigiliragowexanekajuvikuw.pdfIn PDF document text
    • http://fgosvo.ru/files/files/kifinologixiwogu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gixewedirujewuri.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/mowudofobikuraduzug.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/mekitoxogabufinije.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4034131168.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2d44104c1ad8b6639efd64d169796bea/zevikanofamexiv.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/3271760202.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c56a608859dce908b774161cdd8b9560/vazubijoxedowalududixe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905141014.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/zofirogowivujusuva.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/40953411064.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/31246745895.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e96d3d8a3---72898893228.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/sozitote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=live+football+tv+onlinePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/gevozurufuberazesugejoged.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_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 17588 bytes
SHA-256: 94a9e8a29c5d80bc7a5e0e7d1c3e82dc92d175990a64e475ad89c60b88002cbd
font_01_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 10100 bytes
SHA-256: 42124b87941fb5a6e6f93ba3aa22ecd7a04a59f0e3ffe7629aa2c0ca7ebe1cc1