Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bc8a031372febb…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 16:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29a001de0a0a18ad1f566a4382ca922f SHA-1: 0d23bcf4a9419bbef6b8eb2ccbf0f6122b8c0b45 SHA-256: c3bc8a031372febb10126093522c476e7056f88c13885fcbd31264d35ef986d2
96 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to distribute malicious or phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2271a204---kakimopumasibig.pdf
    • http://akicgiyim.com/userfiles/file/36801331696.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/nb6c867gd0pf9q3qbvlua3ikm1/kufuvonotur.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ia1mhe4g4dcp7gcngass1miit2/kamifaraf.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/34199100099.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/6468bb40eff16ba1ee7ac664f50781ab/25309535172.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ieduei2gpr7lc8i2060rg0cubf/lajesesatiti.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cad81387fe3f2321b8d203fc48580b13/goteloturedatedosu.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742e52436f0---3550196403.pdf
    • http://championshipsportsrings.com/clients/23492/File/gopabuxozesula.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ad568518076b065ffcc4fd8fbf2e4c89/lefevemobojomuradid.pdf
    • http://vmkmsz.hu/userfiles/file/tavutatolodomed.pdf
    • http://trustarshida.co/cache/fck_files/file/56701382864.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160822e8c84b33---51833054667.pdf
    • http://lulanjina.net/upload/files/zumesufogefepex.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4283294d---vuzijipadivuxakokew.pdf
    • https://anmoul.com/userfiles/file/51041822416.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb6f2bbff---82990279639.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160acad61770e6---sugojo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f0add75b---vubazetoluvodanijola.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e4a17bae---78856132801.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76ba5d8ec---61052393838.pdf
    • https://agrilaui.com/userfiles/file/76775137041.pdf
    • http://www.heksan.com.pl/file/nufodabotivaperuxidazug.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fvd6a8ntrkn3j8l5i5ll99qv43/zikijo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1svc9osv4uq0rdj8dfuge2lbq1/99601109087.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=does+swimming+in+chlorine+kill+lice
    • 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_off0000ef17.bin
f20aefd077e7bad4d1aa2cd08d74792447a27a49430c4e13b42767f42ae8f9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 16728 bytes
font_01_sfnt_off00011a26.bin
a8008523e7b42d9e45535b3796aa4ad3aa661e9a6b8ac5ecc04a8142ad1fce89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 10596 bytes
font_02_sfnt_off0001322a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 16792 bytes

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