Malicious PDF — malware analysis report

Static analysis result for SHA-256 a966ce42d1f2ed6c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-20 17:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54fabbbcd6b0390ad3ad2d14300f2900 SHA-1: 395ffb4236fab48194cf994ae6ff142a276867d0 SHA-256: a966ce42d1f2ed6cd01fc060b6f2a5d8768dc3d41d169ff051c99537e803d0c3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to phishing or malware downloads, and contains instructions to disable security software. The document also instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/05666c68ff3edb0abc86f137f4a5df9a/kilopapetivafa.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/61501bde5c11cdc32b2bddff20d4d39b/17813766028.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lvn7ss1s0hsvpn208sscoj6c0e/41749483530.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/37244600117.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jt9g6qbvc8hhcmcslsfqub9816/43368399480.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ce9a65e8fc813c6cb58fdff45d971e15/61862875416.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zetesawoteximewita.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f3c3fe62405e96748a0568fe4b57402f/53662044276.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/73763653826.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27c6082ac---xazexojiwuku.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748785582e3---3535034020.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c890af7f92ba613aa96c3872eb2cdb64/33282406609.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/nibezabiturasivesetaj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510052522.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/54dff4458e28d3ef9f96331d9e0af131/28261574710.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8643e3375---tafeguxusevabawomufivoget.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ba41c58b0e2fbd4ce2c26dde1f9de0a/xovigubozezifogexigidis.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da791760c2---vapobipejabuvufatutaxoz.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f6119e3c5---kolotubuwipir.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/tozurotitopedotirodow.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/suzatufexasobezadibitaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=miracle+frp+tool+thunder+crackPDF 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 17540 bytes
SHA-256: 1877d362522a008da07f4a0cdf76a68a7155f9dc28b8d27d77fba3c976fb231b
font_01_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 10736 bytes
SHA-256: 7db93ae75e9e3f4a8b3422f53c7548baad7e3e1b0c1f7130c62383a0c24ef75a
font_02_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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