PDF malware analysis — malicious · def32c80f9d53bd3

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 19:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 6328ee12d64b86b987fffbc7dff3c02a SHA-1: 988fb7d14e8e240ce556639678d3069a3cd8d65a SHA-256: def32c80f9d53bd3bec74f63c8be39b36f30db3e2a04adeb853242e2b04b96b9

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' suggests a potential phishing or tech-support scam pretext, aiming to trick users into interacting with the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a4cd0ef82287a9ddb88ea6073802d6e1/dufudiworisilawewafedeg.pdf In PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9bb0bce7---58840221092.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb352b99def60e6388f285e843194b0/73512964978.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d016c4ae49e---fokilozuxadujogo.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83682bc2bb---3014070542.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607944431c488---buwunibigigila.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1d1e7f77---27494944899.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f6431bd4---zoniluna.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b3d650f156af41d27e4a46318abb3a35/21783455463.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c67470f7---bifezaxupuji.pdfIn PDF document text
- https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/libumimawigufa.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ailcbcq9grh864o7ufh353745i/lupodifutejekonunutoduwa.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85ab4fe9---91569534852.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67265beb00---ziriwanakurimojuresu.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8775a83d9f5a3f918ab9a509ab17aede/xanejijanozo.pdfIn PDF document text
- http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160987acc68525---dogajaf.pdfIn PDF document text
- https://uniontend.com/userfiles/files/80161010065.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b275743ce5b1b6fd1f0a1eea8152447b/lataweputa.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/24516689244.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d524cb0e123---45631678145.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb08b990fc---59606847522.pdfIn PDF document text
- http://khodahoanglang.com/admin/webroot/upload/image/files/dopogixul.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7c3fc130709ace06a10cd1be7f07bbec/55388125198.pdfIn PDF document text
- https://gastrotest.co/ckfinder/userfiles/files/xoxepatejasufax.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=several+hours+meaningPDF 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_off0000ee01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE01	16776 bytes
SHA-256: `145e3ffc27b57791478fa42959f8ddb4dfc003967b71fa76b284c3d8a28f2303`
`font_01_sfnt_off00011992.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11992	10700 bytes
SHA-256: `3dc3d62312afecf469ba78d84f2213677769d4f2ef56621570e08bcf688fdddb`
`font_02_sfnt_off000131ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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