Malicious PDF — malware analysis report

Static analysis result for SHA-256 486c4511f0666edc…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 17:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab6356e0fdfa8d605be6fd5be8eafea SHA-1: 831715087a52c6f4c919d00f3cafb3d0671349b1 SHA-256: 486c4511f0666edcc71e8db3af0b348c8674a2730dea01b62df480719406c5ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external URLs, many of which point to compromised WordPress installations and disposable hosting, suggesting a link farm designed to distribute malware. The primary attack pattern involves directing users to these compromised sites, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://wskinbody.com/data/boardData/files/zetibaresujenekid.pdf In PDF document text
    • https://seerupit.dk/assens/file/97011805072.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/71ksqeknjjnf2crdifs56tm2b8/71323189400.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ffbe229b681c04e98ecff71cf4ff5f5d/98491310444.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb01c93254---74100376916.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e540454b42---59365314359.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/21b68c1daea61d685a30534002066df8/kebemeratexukawikite.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/vabomonili.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3888ac5f3---3690576786.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/91202732470.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/4932672380.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c785d72215f0aaf17077ba825d3cad77/16070555631.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/96512799409.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079276512343---gujekufijexama.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jugetixomivifipogobenedib.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/50620366041.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c3fc1683---furopitibexevu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/20c2c18d12e9354df12878e9e5322c75/66455840687.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/votagakenisuxeliloz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55524e8e4e---60172505249.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac40d24ca---97128147313.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/31cea441ee5c358271e0a3f98a98722c/fejovukekajebiwimebiv.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007070d6c7---xefoxetajivodafotakigi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mugagiwijifetazanowozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+pirate+ship+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10448 bytes
SHA-256: 4cf8b9bd6f1df5442e47469b1f056e40e5a7efc7da67ac6de6a86ab1f9c500e2
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17508 bytes
SHA-256: 168d5c6a1bacca47dea7bb30d20af1fbfd626c8819558ae2a981c99901d88db5
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 1728 bytes
SHA-256: 3e54697433f258519e59b5d4193970bd3702f67e639bb31f2dfcde737eb7fc9e

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