Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77b0d9b17101e93…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 06:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f55fc453adef229c1ee1c00cf8131a46 SHA-1: 2c52b1ae7cc9ef42125893bbae6ba982e74df79c SHA-256: e77b0d9b17101e93b632dd07b920a077fbe567ffdb164e7f0b19d35f0f71d096
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links align with tactics used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://boonfagrandhome.com/user_img/files/fuzurixujivo.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/tamexosoxi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147755c7727b---xotalu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/16694479438.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/nitemokiguvojevig.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143261cc5ff9---debadevu.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109031520313754.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kababonumiwogezabewanipux.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd0c8568bc---saroxabi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9tf2u7k9oigbiriip82vnbmd56/15587562477.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/95223042954.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109091007113443.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/10954490306.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/bufomutibofagafazij.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/50030524168.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/rubinefiganan.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/rowad.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/116997dc3d28b55b29eef8a3204f0fc6/zidunitasifafumilo.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/38381168442.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/83214833125.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/84672272956.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/4974047206.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/65138581976.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/rabew.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/17052103086.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jugubonovexejodikimodage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=online+rpg+avabel+apk+modPDF 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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 10792 bytes
SHA-256: 32b302d1f5171a2e9416db025bcba84ef48b54d2898aea74a3b66515989b918a
font_01_sfnt_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 19692 bytes
SHA-256: 5882e10b66e8bb331da3d192f6dd6b3bca3f85ca2bf4abf2c04d3e23a1f78903
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1