Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d02bd4b67b2be3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 15:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ec0f22f423f1003aba13c99011027c6 SHA-1: fd5b2bf1faa47b2c77319bad1c2a71b9c40cec0e SHA-256: a4d02bd4b67b2be3dd884439a0e8bfba3cdc881404919ec7b54410ec13997240
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://drafthe.ru/uplcv?utm_term=networking+training+courses+pdf PDF link annotation
    • http://keystoparadise.com/userfiles/files/sedirep.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210808142858.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218c346c720---11282821704.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752116546d2---52422387895.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/70b58f121ab0dd8c220b5126cda31661/50906538735.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/43350321250.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///difolizutil.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/88729917060.pdfIn PDF document text
    • http://vo23.ru/upload/file/jijidomu.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/weboxiku.pdfIn PDF document text
    • http://www.pilartangguh.com/file/58213983496.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607807bf81d82---jilelovepinezonijuwenan.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fubodug.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/64523750527.pdfIn PDF document text
    • http://acril.ru/ufiles/files/97445126185.pdfIn PDF document text
    • http://korytnica.net/data/files/82744254423.pdfIn PDF document text
    • http://modern-pro.ru/files/file/84028728674.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e02dbc1600aed0195a636908b2c0e9df/dibomixigepududida.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sezifav.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/20995372999.pdfIn PDF document text
    • https://wecareprogram.org/images/file/gudirewokugasawota.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7cdf9f58a7c74952dfe35a0700bb56c3/xoseditudalufawosafoder.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cennpais5maa4ntjn8vover970/82409655493.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/33258495455.pdfIn PDF document text
    • https://777mto.info/contents/files/beniduvinuxukodopo.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/21530030850.pdfIn PDF document text
    • 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_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 17596 bytes
SHA-256: 5f2d028130603ba3e5e55f1fa798d5e000221995aa6e59a7c6d625657512a823
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 11004 bytes
SHA-256: 0c9b699fdc5c207958adf309baf8574072b5a4f1d378ed75d0ec6b5073ef639c

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