Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac771744c8048c8d…

MALICIOUS

PDF

79.7 KB Created: 2021-07-19 10:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8db4ab243198fe35de9239f1e114446c SHA-1: 3698fc55176aeb79e844cc544c567a746f6be64f SHA-256: ac771744c8048c8db9be1a6ff145d00eef33ee67dd05defcdaf84500bbee574b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3db4b81023c0f920df4375853b45f36c/39139831474.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/24bbvdpbh6ightihg8piljuc7q/likisovenuk.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/20423128826.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55976109903.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa97eb580d---16747241569.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/7c3fb0144993085b3c18f740ae67f393/45758112552.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/68504810635.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wulebojubarijekixog.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/694e44a0ae387dbda5b0d94ad507bda4/fikoluregukojunonada.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/bigumetifumepiken.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/nafenox.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809787c0e0b---33143793867.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/70a52f227d43518f1e837f05e72f67ab/xagoduka.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fedez.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5178262ac1---jilukivuda.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/5764211764.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/90365475028.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/gupiwofidaz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/emuaihm2ab06u1cbdq8vsoicks/zodujalajat.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/vuvuwede.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/59551123530.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/tafaravideregazomiw.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekitomeketoluweton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=diocese+of+tandagPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 19244 bytes
SHA-256: d61f42ec51bb765b4a319b8b018fe7672e5bf124aaba5919bf6f154c910f39b4
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 10508 bytes
SHA-256: b7071d22527349b998cb80096273feb772135a5818ffe2864d42a4658ec2a0a3
font_03_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 2872 bytes
SHA-256: 38502f5ed24d2cff02cf584cdcdff528bc86497bb5b1fd748bc972c3642ebc8a

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