Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdc9f4344775504…

MALICIOUS

PDF

80.4 KB Created: 2021-06-25 13:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4508c95798bf9650a1daf895c7124f4d SHA-1: 927dc0a93c56cd7f4f7aadd08b9e157e93b606f7 SHA-256: 4cdc9f4344775504b3a748fc0a0f58a1bab398f1f4a92f3a635e40fb91a1c305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://goldenpoolandsauna.com/user_img/files/nokul.pdf In PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vazivigubarevaxogeruba.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8aa00700a8313339d30a47028007c32c/gabefagetewalimig.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160948a875a0db---28423772455.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/17996885661.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/teperij.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vukezamezikapifowilawe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc918ba21---sipemazubet.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4d9fec97ceb0bf37729c31e159f2ffe6/16917511387.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbf45d2f4---deseduloxekuvagegimipi.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/e55o4dacgi7cf85hs2lfjiarja/pitimexejami.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/42393909565.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78365393837.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jagogedomilavujebokisaxa.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/37827291416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=diet+to+reduce+triglyceridesPDF 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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 16440 bytes
SHA-256: a072d112ad0e47159ef9ccd13f07dcdc3ba4589b95a8fdd69b0e883c1d225631
font_02_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 10492 bytes
SHA-256: 321b0f1c564ce0f5831fdea6174f34a8715162df65e878b1d217393b6818e2e6

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