Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76db4af4f7c36fb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 05:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d23d9264d5f4027bfa0ccdaf25fa24b SHA-1: ceb9252da94c48e93aaf7baec04d2637c7b24841 SHA-256: e76db4af4f7c36fb185eb1482ed9762087f529c2309de0bc0f81e064f09acb7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The document also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://npi-management.org/ressource/site-image/files/33527753778.pdf In PDF document text
    • http://agt.es/files/galeria2/files/jorume.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kexubane.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lalorila.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/76891614930.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130417aac633---naninasumopiduma.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/miveb.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa90f7e889---45628272175.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/mufawaxipesedoxan.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/31443105450.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3343535421.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad8fa08b6---74251573237.pdfIn PDF document text
    • https://gameclub.by/uploads/files/67933065686.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/52949263160.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/88880869203.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/tujidikuto.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/25488870912.pdfIn PDF document text
    • http://dialogueinpraxis.net/files/docs/loxagakamemi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/63398726340.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/ralesabilodapasu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n32q5ue1du21bb05940d97t9d2/18047612458.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/xajerojofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=photoshop+tutorial+pdf+free+downloadPDF 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17436 bytes
SHA-256: 9dbd55a5851660b5514a639c62366f5dbeb5dc29d4f34462d6aa9c31224a305a
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 10784 bytes
SHA-256: f40c6b88ecc5f44f305a967aca4a695eebfda40951f171a0182318897317afe6

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