Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaa4b229c81240c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 14:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c80edc033e18aa877e7c8e714cafd5e SHA-1: e459d11b5b0f9f424f139d41855b20186b83749f SHA-256: 4eaa4b229c81240cac9609a220a3dfaf96702c4d3587bcebdacc6f926f4d6633
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing numerous external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or spam campaign. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=one+punch+man+chapter+one PDF link annotation
    • http://myucmas.com/userfiles/file/18787346361.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e9ba94c7---51479607469.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d9732b3b---gepuj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/39b72512f91e51e3ff6cda0470086f86/74516078419.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160754c4501719---vokod.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/416b33a7821162e61b2b9fc8b2efbdc7/94986161637.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vokumorovuvujugujas.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd59a4784---wajomi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kabekovuxikob.pdfIn PDF document text
    • http://fedime.org/imagenes/24076885095.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/vasutafabugive.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49a08b727---29705777165.pdfPDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d1c7678919b3ca66675dfa235b4162b/25411913601.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5ffcd1e159407db15f90784cd95d6e3f/venakavewikuva.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/38177e5d18b3a5cec9e39d75014eb681/67754265056.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/1437924543.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47ea2fdcc---xibekebapukufekebabokida.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/momemofuzu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161254d26cce9c---wonudopirugafosovusumeb.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210714_40FCE70B6E97518C.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/disegiwugeruros.pdfIn PDF document text
    • http://medrea.ru/upload/files/jexifi.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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 19640 bytes
SHA-256: 69393df845c717c7b9cb46e88cc2cd971458cc4c7d5a5c31c5770d27edc17ed2
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 10460 bytes
SHA-256: 8084313b7d6a1f8960fac04e33913e68675cfe219b9d09aa6d0f57e2e236ba2f

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