Malicious PDF — malware analysis report

Static analysis result for SHA-256 3760afad17f4bb92…

MALICIOUS

PDF

89.3 KB Created: 2021-08-10 15:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cccb5913c8caf2605d126d75700cae0 SHA-1: 075aa8c728f3805c0e73f8ac046687851139f44c SHA-256: 3760afad17f4bb9289d66a8a73a709f6303f05f1b38257aef710c10cce5e6d0f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on potentially compromised CMS platforms, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160768438e82a4---99930304018.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07adaa1e15bb00966b21131531dc35b9/vevezalogitenunil.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f123a5eb653bccfc61870bdbf779fb1a/zepojugexufogefemanenomef.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b244de01ea1---lenabeluzevun.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eac281b90---95384530225.pdfIn PDF document text
    • https://oliogalanis.com/file/11677394245.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/570a0f4031c8cd8c8f1a95f9f1dc0dac/didikumamuzavuxox.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/79855080105.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/42232996417.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7ffd69d6---81188435950.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/kulatik.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/sigujusufurodumelon.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff00836687---57386519320.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a76ac8426---90388657225.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/kemasuzojix.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bawujifiriwumavip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e9fbfb6a---52310564453.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/27082978388.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1d6c2fb3304dc78be73c196d2ee3d735/denemokuwam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dc99976c4---wudevoxejegukan.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/k7flk7f9etjgcujiamdnkjkmt3/dukex.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/52cdf39c0a69091c1d7216acbdb8b82a/77946310074.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rexakegobeliguzolelujip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+bright+colors+mean+in+a+dreamPDF 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_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 10952 bytes
SHA-256: 2598662e3669e61acb729df041ddc6ee5f63f106df80b259c4362ed3828f6ab9
font_01_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 16528 bytes
SHA-256: 8b0a9e6fd657417fe13825fb489619bc1323f080e9fcce8d7644aa0b080c3ac0
font_02_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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