Malicious PDF — malware analysis report

Static analysis result for SHA-256 54816d6d196ba975…

MALICIOUS

PDF

92.3 KB Created: 2021-07-01 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51323646104378225055748c69c6e909 SHA-1: bd7e3e14236490778301e7cf620671e6f494d4f0 SHA-256: 54816d6d196ba975398a8755e512511cb536b1dda2e0a6dad767537879928e33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa9babf8df---3746406872.pdf
    • http://goldenpeak.it/userfiles/files/40968312581.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t622aaisnkp8bd4aa4mj439o8p/guwabatimevome.pdf
    • http://domeinbeverdonk.be/assets/files/file/21889211151.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e499aedd8b---jowosuxadefewaz.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3764da1f---6319267037.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/71d732c8845cbb50599058c382341f02/zeludabireb.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ad281e97da500c6d2c580d0ad53347f2/wedogobupun.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91573fc23---timalop.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/8b2dc4e71d1bdf1b685a152065cf49c1/76259187875.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608659b34fd6f---mifazejodunoveb.pdf
    • https://communeouchamps.fr/userfiles/file/gikexodubexapokajiduxoz.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c203e0544c2---voxabev.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9be49fa65133399e3645040188ccd30d/kobapo.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/pajukixuwavotopituju.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/daleluwi.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/todedazoxuparomo.pdf
    • https://bor-diing.com/upload/files/21423406964.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/be8062799e09c608499433ec199ab5bd/gavorukevebuloto.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073eaf4af591---56116724633.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/lesawuzagakikekimib.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1c8f662af374275a2f99d523d1046da6/67050595648.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca40d8ee69---kuganajukafazisuresu.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/66d0c34f087974cb425d6acbf59d9bd1/jaxewuroduli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=opposite+of+wake+up+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013e18.bin
899799a515cc5f13b2681c8419d6b66ec09f15a346cc5e56079d32b3e301d483		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E18 20608 bytes
font_00_sfnt_off0000dc3b.bin
3ba5639cc55f900fde6dda5efe435dda7e68a04849308e1edc5a036e4ad16ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 18776 bytes
font_01_sfnt_off00010ceb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 16792 bytes
font_02_sfnt_off00012502.bin
5b78990f4b9f8c3c2554ac3ce3e7329f545a765bd9cc120e327d6481b1f75da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 10840 bytes

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