Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7320383d811c79…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 01:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84cad4dbc649e5ad724fd1047d18b4a SHA-1: 5df5d1c23ab4cfc5fafeaf219dcb7f9a663facf5 SHA-256: 1d7320383d811c79cda2aa2908f3438921c5f45b3b3e4b7d0ec8cd47b02e4e10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d3799810---66076120577.pdf
    • http://aep-tc.com/cache/fck_files/file/xejel.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/885c76458bbbd6ec5042afe1434d8843/44616261093.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/22981169994.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/aitli92t3nbvilavdpe1m3eelm/97624389669.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a0sjuu8bk2r2mhq9iqlo2pkhq7/673049446.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/aafc617a012fcf577464e371caf4737c/52748020226.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58e3ed9d4---27818023062.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nujidedamasawitelewiwi.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/66205918318.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3ab0f65a1caa2f8f0938d6ed04962cec/dewore.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jh3mn5ukn3f5j66ispsp23oog6/39732132211.pdf
    • https://euroroma-bg.org/files/file/zetugevamoritesigo.pdf
    • http://chinamakina.com/userfiles/file/4457488974.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681492c93---fomojikizovomidusel.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d531b097---biwumigeximugixapugofixef.pdf
    • http://ladyqueen.it/userfiles/files/69025449079.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53725369429.pdf
    • https://alamansyria.com/userfiles/file/bagabakixumodimululoxogi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9ff834651c644cae68817a867e076ed2/82121734589.pdf
    • http://bebelino.ru/userfiles/file/tabokuwozipixopagekuli.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/10388513005.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ec2e3bb8e2cda7251068a8e7ca60f2d4/13482348748.pdf
    • http://sisparts.pl/zdjecia/fck/file/naxiwosakedevevinirudogi.pdf
    • https://cleaner.pl/userfiles/file/42655418052.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b4b0f9ad17695b85b042be4024dffe73/lixozenitexij.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3304fa76---kepivosutojokafudete.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shatter+me+series+in+order+without+novellas
    • 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_off0000f66c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
font_01_sfnt_off00010e7e.bin
442dca4bf21c910aa8e8367b1acca145dabf59ffce878caf4f7045217e3dfc93
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17684 bytes
font_02_sfnt_off00013c1a.bin
1c77f4ac42aa7cb0ab19c9b66b85f0c392b634a3bb340ae128d7660799200e81
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 10840 bytes