PDF malware analysis — malicious · 8ca234760ae3a123

MALICIOUS

PDF

86.4 KB Created: 2021-08-15 18:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b80c29499b57254aa24903586f6cf79f SHA-1: 95fb81642b32009d57ed7636c25421f9a661e928 SHA-256: 8ca234760ae3a123e79092859a28165d6b8cc4cb9a5b2ad9f121576447ac8abb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress plugins for file uploads. The presence of a link farm on compromised CMS upload storage suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable due to truncation and encoding.

Machine Learning

Nyx PDF Classifier malicious score 0.9903

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 https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2aae370e559dcb0e309b0493d354dc12/funamekoze.pdf In PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e98d2db7---fenikisos.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/59380507703.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s9vv6iejac8eqncp9q0nd63kg4/6485955292.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d8c33ca48d2025c7b396c8bd44caf1b9/rerimote.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4853b53f0---gajuvi.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/3011812287.pdfIn PDF document text
- https://batikatravels.com/userfiles/file/48104787505.pdfIn PDF document text
- https://cedria.es/DOCUMENTS/FotosFCKEditor/file/73087172388.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/00mt5ton98tm1unqq1uh5k0jq4/zigijamexatuginomufun.pdfIn PDF document text
- http://visit-pune.com/userfiles/file/xokafubuzuv.pdfIn PDF document text
- https://cailux.lu/userfiles/files/juvaluguf.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/6795962481.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db0f3bd156b---kipuvusogexo.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vsmehiqp6ufibaqdr77iquoeg9/zopelex.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4542a69d---telud.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/vajotovonijas.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c40fdbc7e---junavajofidevupa.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845974271d2---5810891447.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v7f91349j3oc43j0brujdtvhi2/biposeb.pdfIn PDF document text
- http://chaukitchen.com/uploads/files/55883216652.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1662f8172a1f250a64f4831b7202f08f/solukujotinapu.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/87e50ca30795e2790040372ad8252a15/21036954354.pdfIn PDF document text
- https://cargotavio.ru/files/file/67997028224.pdfIn PDF document text
- http://hebakotb.net/userfiles/file/kejiparuxizagovilumo.pdfIn PDF document text
- http://sutinlawkrabi.com/ckfinder/userfiles/files/negajozogun.pdfIn PDF document text
- http://visit-pune.com/userfiles/file/32884146566.pdfIn PDF document text
- http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/4766842956.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sistema+solar+catala+per+nensPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e9dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101EE	18920 bytes
SHA-256: `b036832479bbaac292d4383ab46605195917dc7640354ec92a57ccc3d77aa46e`
`font_02_sfnt_off0001309b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1309B	10608 bytes
SHA-256: `a079d391fca9c7d253a2808288e5203d5694283a5d79734e38daa3005fdba500`

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