Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1d05570ce13d92…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 12:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3e5bb5b656107c54adc019c5e2c21ea SHA-1: 25878c0152c3146fd77707a7244b59f1d49fa75b SHA-256: 1d1d05570ce13d92ff176a203a20a310338c6f0bb5ae66ce6dce43d5383cb0df
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://piphoto.tw/uploads/files/202109221152538570.pdf In PDF document text
    • http://105chers.netsociality.com/upload/files/gekajukapi.pdfIn PDF document text
    • https://best-label.com/upload/files/47536893333.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/87247768953.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/waravinalopajenemazo.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/gexafibafe.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/ximujadow.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614481f06e892---semunovogo.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nobasagim.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/detixezubazapujelabupuxeg.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/wudirawatodeme.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02c24ccea---23585620404.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/63933768723.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/rixojakaxevita.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0f0d80471---60624122446.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/kukusit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f542f1784---10736401795.pdfIn PDF document text
    • https://filetorme.com/upload/files/kibakunemiju.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/nirujamuki.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad43c52262---4343796393.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xutap.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/dudezivawonavotum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=top+20+best+fortnite+skinsPDF 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_off0000b299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB299 10580 bytes
SHA-256: 1117bcbf2cfed919fe0f68fb2e34c367bfc4797fc630e7e0d9f96447a0e39d85
font_01_sfnt_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 14916 bytes
SHA-256: 5fa80b433a86212a168c0e2b81a3bcbbd6134bc74ffda323796f8ffe773584c0
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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