Malicious PDF — malware analysis report

Static analysis result for SHA-256 834fda9c86adb5c8…

MALICIOUS

PDF

89.0 KB Created: 2021-08-28 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 592b36f7a310119568c43a8b5b03e0ab SHA-1: b868839798f2e2a7f6aa501fc275f7b1b016b83f SHA-256: 834fda9c86adb5c8f5f6a73e9f2d5670584f5bb049c4a6f3e11cff63181f7927
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kibunajcc.com/ckfinder/userfiles/files/14135999724.pdf In PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/309455540.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1611ade780eff2---14513408116.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2968e24d284d98684fb9ea9b52b953c5/23767018026.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/lenejeworevusiluwawejuful.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc854c0ad4---mimufonebebez.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/20562346125.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/80267438805.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/55689912541.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/2437676987.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a774198e91c---30202496505.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/pumafijusuvapupifuwuseto.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d7c53bf3---31746654506.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e735f00bb185d66fe95efecf111d36e7/rezejem.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/xezuvejesafo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/metomunaxilezobovuf.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/92250778661.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/puvunotetirepizodifava.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f258b64b6---25206929069.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fedumud.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cf30837a2c35f1b04c9b25d4231a6ddb/7300835261.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b438435de5---punijavupiwezuka.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/zapirotugadawovamisekogaz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785bea7667d---tagejanevapoxumamal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=artificial+neural+network+in+machine+learning+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 21728 bytes
SHA-256: 3b83e70ee46c0b6977a8f22980aa7e3f912056406d2550a4db4fd2b12f957e93
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 11156 bytes
SHA-256: 93ff1a5d962c6dbb3778441e2fabb33ab06d914492113d43d3cc6066e8b720a7
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_03_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.