Malicious PDF — malware analysis report

Static analysis result for SHA-256 d930c4d85df91570…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 09:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d56484dbf028ca4edfd87c197e8b0441 SHA-1: 356bc05b70c36a68cbb33fa06414deb48b497973 SHA-256: d930c4d85df915701a5d2c46eb2d31c8a0a7636f346a83fd657ce9c3a1b64a08
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The purpose is likely to lure users into clicking these links, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f0940fe034c884eeb30e6d0873a837e9/84738381894.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/dobakabowafateme.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/musexevegebumujufiniwos.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/14092a06eb7717485875b69db6c8ad80/35963659888.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdf94f5b3---vidolufik.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2de21f1673221c0c46907c17629145fc/72686492447.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/68425277585.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zuvuzaxodutesomodagoli.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b7dc5f78---suwurowuxe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078083e8f787---92486315899.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sjc4vde4j596vs0lcoq2stsdlt/lukitajopev.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210629_8050C769EF4477D3.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b782464378c---pakipu.pdfIn PDF document text
    • https://kopari.hu/files/file/1206885851.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uv8r6ln33bdqvkvrvf08gskelf/famebafemumojomufunusa.pdfIn PDF document text
    • http://recviem.ru/img/upload/69655930088.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b953d18de---xadadifoda.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c83f1c77---sadiwasuj.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/44771451265.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c787d277879368dc7264488df1a1365a/23972846746.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e17d174b6---62985822116.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/saxitep.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210723105658_1669436915.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/271qtr9dt7vojpumdi0qhf2mnb/mudugafin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=water+scarcity+in+urban+areas+in+indiaPDF 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_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 18060 bytes
SHA-256: b9cf93d54a0a4410ce7b3d721304d28cd09f4e78e3337a00dfe8d1697b7160bd
font_01_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 10544 bytes
SHA-256: d50ac90823d263e0907c88880777e8405c6c4123f53b18ed62c2a764957b8030
font_02_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1