Malicious PDF — malware analysis report

Static analysis result for SHA-256 d326f803af943d5c…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 21:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 190547de6cb80262be6b113a73347856 SHA-1: f302e3fcfb38e82a7adf57344bed7dd9c109040e SHA-256: d326f803af943d5cb487117983989208939189e1c9a49f33e319b1c18519871f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, with the lure text suggesting it's for removing DRM protection. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe3e91767---84206105221.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/negevales.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/jerujezokaliga.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/24929711443.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/22105454504.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/83602959277.pdfIn PDF document text
    • https://efnnma.org/files/file/40362464576.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ecf676d303366f3ceaf99105859c3ba4/99318383507.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e340f0712---xazemog.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0328b46c35f384bef78625d893eefc5d/61023439822.pdfIn PDF document text
    • https://iword.de/userfiles/file/44765567228.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724b2009435---49811975450.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1746e726f---dozapi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32cfc0635e---65704586423.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b1e8a2fc---gefizomubotijekujatoxiwaw.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/cfb8755301df8dfce879bc41aa0147c0/menuxofugowire.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05a5aa5784---74126907120.pdfIn PDF document text
    • https://isosklo.cz/uploads/9753059849.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6sji0nug6agjqa04s7cb0snhf3/faxefogo.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/43822691393.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q2ljv7960i9fnrh7s0p82hbo0s/zimujapenasixakepulegudi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc06bd3ce9---7310968591.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/127b9da7758030b533a4827767b7a3ca/gokajebalimaxanivuforu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=remove+drm+protection+pdfPDF 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 17288 bytes
SHA-256: e78116a2390d201b7fab096d0827e359d7836452ff7e8f59d3cafeb8b1547482
font_01_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 10516 bytes
SHA-256: eb68ff92331dbd6cfe925a616c8ddc38166ccfe487aed5a826a812a2dfa74892
font_02_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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