Malicious PDF — malware analysis report

Static analysis result for SHA-256 940b45bac27a4731…

MALICIOUS

PDF

96.6 KB Created: 2021-08-24 20:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd8f5d1c228cf30421bf529aa5e43e56 SHA-1: 15aff8596192fb249e21654b61b106b8d0b18b6c SHA-256: 940b45bac27a4731848217b9886fecff3a09a4999fbe6cf1c8f4376f06230a6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The malformed stream length heuristic also points to exploit activity within the PDF structure. While no scripts were explicitly extracted, the PDF's nature and the presence of external links strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://inwebjor.ru/uplcv?utm_term=gta+vice+city+free+for+mobile PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c17168f45a7abb9fcca8d41931d27664/26416229691.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/mavedotuvipabe.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/saror.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3d8228220a861aa65f021e67887c5bed/60179035441.pdfIn PDF document text
    • https://activepymes.com/pub/file/34708529796.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gogekakoziko.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a0d80a2b---60574231097.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4e7431226a91d4f4638de96508a235cb/lirusanuroboxizogujo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/iqitivugit8t80l6o4fsg5dpud/52585752825.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/najogazivapox.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fccf207b---gilan.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/dizipoluvefugazedisumax.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/955d8ph7024upkg231es693275/5526615877.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/86206871804.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/10581441151.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zenuzudupuxos.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b637937---takepenoxomakopupebava.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jujebegovolozurenosoba.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/fowosemi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/546fc787f8c173df95033bdc4264fee6/fexavuninilisemadabekexi.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pipababe.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f8e0nin1fijp7j0sdqfo8rkvn0/fituvitoberefivowuso.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/nefubat.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210808182148_80uuls.pdfIn PDF document text
    • http://393citizen.com/upload/files/95471829619.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2mutg7i1q7df990i663dnmglgg/38457735552.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_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 17968 bytes
SHA-256: 4b1ef57e7fa1e08fa0b72f1f698eea48fea33b04192ba6dbf7164105617c32f6
font_01_sfnt_off000142de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF5 10584 bytes
SHA-256: 176a692f17f6e43ec9e5c6936aee77b297901d144552c18d1992961e3d29391b

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