Malicious PDF — malware analysis report

Static analysis result for SHA-256 905dd068c62e455e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 16:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 636458d6e3e839b5b7cb9cedd248f888 SHA-1: 1f3bc85775c03f4986a53fd94c01b70d13bf160a SHA-256: 905dd068c62e455ea42e98b8c4e4b1cd935daf2475912bb7b70c80737910a2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://valeaflorilor.ro/img/uploads/file/bisisoxifabewerum.pdf In PDF document text
    • http://vipforiraq.com/userfiles/files/33389415283.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ql4ep3b67ad2kqpt25mqvu1d71/99878024630.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/tumujuxugizupumo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/35765305425.pdfIn PDF document text
    • https://invest.pl/userfiles/file/28484937504.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/vonetamarulovimep.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/26249452979.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9laalflv5h8tec4sb26aeoj66b/11227270448.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/54331006829.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/daxinogujapuzepaj.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/18828663669.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae0603f09f---wuweboxode.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f54de17a9---zimukakuzi.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/03a378b902dc2a8ae4115c0e13babf16/1112138165.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/44255523155.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cbf88189b---86994319092.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/38818125527.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/worizidifofofapi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/al6ilam1as8jbo2fi7nhgpgun7/laloduwilikat.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/44680368887.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/33132334143.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gadudasamesas.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/7090751902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=blue+screen+equal+or+not+lessPDF 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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 18520 bytes
SHA-256: 39476854749cf05a24135b8230c4da607206dc24bb78d589b2edaac8277dd581
font_01_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 10432 bytes
SHA-256: 76b0b0ed8448c3fb5cbe3c900ee0dfb185ec740e0088f08a64c32332806df40a

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