Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8bac24474b5ece…

MALICIOUS

PDF

101.7 KB Created: 2021-07-25 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d247dab9cf70edab8fa9a9de4983e55 SHA-1: d28f33310b7463bd95bc26da181315efb946f427 SHA-256: 8c8bac24474b5ece6811e1ba420b666c8b71a71a286d0b541c21a70f0326d2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.tecnobor.com/ckfinder/userfiles/files/xazeb.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c96dde626879cc2693275cbb8092f0ac/xuzuleninuxibapumexopupin.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/35610348760.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4a4a84b3d7bbb7dc84d6dc7508f3b76c/vajanilejebiseduliraw.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/66d5a4da230c7cf7505600a8b95c58a3/gasebutuzunilagibo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a4466726---jobamug.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/12ea34d9a9ed219b2cd7a97b4451f6da/87607501103.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883ca3945b---1340034141.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/xiwuxuvigagevubapab.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb129d8ed0---32221409713.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26bce327fa---nabofaguwiladanugufakoxe.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50c47effe---81737231690.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdc7d57067---damexesuvokup.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c1e529de---woruvosi.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ff224558---69014598206.pdf
    • http://hongdacable.com/d/files/jizefuweretugepinepebap.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29f721f12---45675505047.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb1b64e66---46087346615.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e647hjllqsdon9720th1ca2o6c/xetukekodefaxusobubed.pdf
    • https://alperbehang.nl/userfiles/file/92613582563.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b8557763---nodidowonatofo.pdf
    • https://rm-parketi.si/uploads/24643890553.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b978cbee14f365dc268bdfdff97ca5ad/jikaludibukozofugopub.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6np27u4v9g6iqrat3fei1ohcae/56780688488.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0d8031c89---xovorev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manuela+saenz+tuvo+hijos+con+simon+bolivar
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012651.bin
0a56436cc9dbfdc5ae695ace3360bf9153bf300174d8f4578444359b121b9a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 10984 bytes
font_01_sfnt_off00013fa1.bin
b522afcd8d82accc4b950b6380f8fd859e7365ae101f33b3ab7eaa9bd79c60dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 18108 bytes
font_02_sfnt_off00016d94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D94 16792 bytes

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