Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e1a93db326cbb7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4df40efabe04be727a81c99a39c33f3 SHA-1: 80a215ae86c3af018f466b68ea76ecb42b529511 SHA-256: 52e1a93db326cbb7e83eb45fb9eb22186e9b9432753891eea108d1d921900556
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and a high ML score further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=best+app+to+clone+phone PDF link annotation
    • http://dungcucaytrong.com/images/files/modamigorawu.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_140218.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/lunuwejadidovalosi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c99e459a85ddec8d275b2b1e499b9fd6/fovomu.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/labeditozeg.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/dujomudezuzokujuradogo.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_205909.pdfPDF link annotation
    • http://dekobonner.de/userfiles/file/98835397151.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/tijikam.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/50826302163.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210913192459.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/73705853923.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/23785274691.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d7c3d2d8---42625090656.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484e74ebc8a---tonapuzarobevozek.pdfIn PDF document text
    • http://akademibt.com/resimler/files/10057749458.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427012bda5---1601796908.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/42331894642.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/70319147538.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3732f271053195d1d6dca1ad4f618e11/47221735617.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/fajiliwowuje.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/terebajexo.pdfIn PDF document text
    • 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 18324 bytes
SHA-256: fc4b9cbdbf66e9ef38b4a006ec7e22f508967d09da3ff1a0b08b5bded12a639e
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10332 bytes
SHA-256: fedef4d172dc1540efa96790dac36559d1f24ebeeef4ebe190808a9baaedc747
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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