Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cc8ab808cacecc…

MALICIOUS

PDF

89.1 KB Created: 2021-06-12 14:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f48942a23589aa96f177f7940939982e SHA-1: aeb71015e3a5c54f7ce909dca755822ee3971403 SHA-256: 07cc8ab808caceccb32cd5f8bf1d20f202f51a71304f94ac78e39a17a015f534
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. This suggests an attempt to manipulate search engine results or distribute malicious content through a network of compromised sites. While no scripts were directly executed, the structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.0080

Heuristics 5

  • 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 In PDF document text
    • http://aep-tc.com/cache/fck_files/file/xejel.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/885c76458bbbd6ec5042afe1434d8843/44616261093.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/22981169994.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/aitli92t3nbvilavdpe1m3eelm/97624389669.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a0sjuu8bk2r2mhq9iqlo2pkhq7/673049446.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/aafc617a012fcf577464e371caf4737c/52748020226.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58e3ed9d4---27818023062.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nujidedamasawitelewiwi.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/66205918318.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3ab0f65a1caa2f8f0938d6ed04962cec/dewore.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jh3mn5ukn3f5j66ispsp23oog6/39732132211.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zetugevamoritesigo.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/4457488974.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681492c93---fomojikizovomidusel.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d531b097---biwumigeximugixapugofixef.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/69025449079.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53725369429.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bagabakixumodimululoxogi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9ff834651c644cae68817a867e076ed2/82121734589.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tabokuwozipixopagekuli.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/10388513005.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ec2e3bb8e2cda7251068a8e7ca60f2d4/13482348748.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/naxiwosakedevevinirudogi.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/42655418052.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b4b0f9ad17695b85b042be4024dffe73/lixozenitexij.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3304fa76---kepivosutojokafudete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shatter+me+series+in+order+without+novellasPDF 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_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17684 bytes
SHA-256: 442dca4bf21c910aa8e8367b1acca145dabf59ffce878caf4f7045217e3dfc93
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 10840 bytes
SHA-256: 1c77f4ac42aa7cb0ab19c9b66b85f0c392b634a3bb340ae128d7660799200e81