Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd360ca42a2e75f…

MALICIOUS

PDF

125.0 KB Created: 2021-07-03 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7d628fcf3c9d043f069f44cebdaa342 SHA-1: 980c3eb69cf5ea352479de6e4c18438979949939 SHA-256: ebd360ca42a2e75f55f4de56dd5fa0f8fe876e95eb0546d060c93f5d0082628a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9793

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a632233af3---55269358898.pdf In PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/deweledobetiwiwisu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7bdc27384e1f1cfaf630fdf718555086/50673204297.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/61266161020.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4233c15d---vavubebifezizulojilidur.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tajodil.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7895ed9d3309e6e4706acd66b880a2aa/85718302614.pdfIn PDF document text
    • http://aven.su/userfiles/file/96630250250.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/718d9b04f87b4b13d6542978036a3392/88938858694.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/n3j530dcoi43726gie8djtl466/sipibuto.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d568cf803---mikovebusepivopiw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bakamujodeteromavekebura.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/itctlivnif4806pk3askvo7sgh/kuxez.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1f4fddaf89d6d01cfe893f51d6dabf25/10334128289.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a82a7f8f3---5483976460.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8548b83e---tedajesigupavelu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ttevs9inrlkih9jmi6udslamcn/11523264256.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5f228c04323e765e27102fdaccf12ad5/96305203011.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/9lp53r6cuogt2rbv4fa0i0cid3/51086323803.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c64902b2c77ff6f127ed743ad889aad2/87911338920.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/semezilirepudifurivetopo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/36b08a9f92d776c09f331dd02939182d/4333914514.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l9vgvmdkek9gc4febn48qqi305/79909596636.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gipavum.pdfIn PDF document text
    • http://www.polni.si/Images/files/patazaga.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/278db6d5b22436128148bf3287b83349/41403264485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=prepare+yourself+for+the+bac+exam+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000185f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E02 17828 bytes
SHA-256: 0a0c9b2ebdbae2110fb3d2c5be4c2876e0ff0b23e0c0c9da23f05b927196f416
font_02_sfnt_off0001cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC73 11148 bytes
SHA-256: caf19c505e1f815ac2b67c955a165484d4b3baa8b20cce403bdd955eb7391fbf