Malicious PDF — malware analysis report

Static analysis result for SHA-256 4999b1178723c128…

MALICIOUS

PDF

132.5 KB Created: 2021-06-22 21:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8521d47a10aabe4dcb0905a49c9600a5 SHA-1: e2bb903d591ca0ad3fccb7773d23265651545ec7 SHA-256: 4999b1178723c128d03225aeb331c30b9d7f636532ccf5cbcb4b386732747698
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it's likely a phishing or malware delivery attempt. The document contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. Additionally, a heuristic detected an instruction to disable security software, which is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • 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://nomylo.ru/uplcv?utm_term=rtnetlink+answers+file+exists+rhel+7 PDF link annotation
    • http://zoltysnieg.pl/pliki_wyswig/files/38367492300.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6f8b44de---tukimumipilukosupeb.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a01a5c4a8---kabelawofedawuk.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lre4mjuvg00ktm6897ruq36qkh/17222164708.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0354099a3---90943265542.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be79abfe7---pikezetesasinopirixiluju.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989e5ee2fe5---xudewegaf.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/77423267253.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/874ffd200ebb74721760c172200ee430/doborukexutibesepumikaf.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/61da8245853e115619e8f29f06ef7a2c/tegijetanemapodofuvexik.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766f89f014---40755281229.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a672c21b666d0a3ff83c333aa9a0e9a1/burod.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e1c5394a---30521487557.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/zetopuxoredatosidudabutiv.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/kepiberu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609427d13d711---99694142977.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cdkb1jo7cliu07moueg33d3re/tefinubepag.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf70b58ed---zapanam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 65160 bytes
SHA-256: e3715bd4ef78737ba7e17fd7de1ab1d5c761c10c46e9dbf80295e91638b93442
font_01_sfnt_off0001a8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DB 5168 bytes
SHA-256: 8e7ba074c14d720921adf0c8d3f7699349a1807af8941f69eaaab35a6f53231f
font_02_sfnt_off0001ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA8D 16828 bytes
SHA-256: a8654d618a463f83418709caeb730cea924936615bce81c5b4e4be89b2d634df
font_03_sfnt_off0001eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEE7 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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