PDF malware analysis — malicious · 9ad3321c63b5b521

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 04:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 9267d488a2e49ed5c72376080874ed39 SHA-1: 012d707b1759bce46e0c53877996836cdd2f2987 SHA-256: 9ad3321c63b5b5219cc9803d31ee97e17b0f538210a01ef01ae27f0e14d522b4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely to lure users into downloading further malicious content or providing sensitive information. The use of compromised CMS upload storage for hosting some of these links further suggests a tactic to evade detection and leverage existing infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

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.
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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f82d8fa16---pagukupiregazuvuda.pdf In PDF document text
- https://atcotourismtravel.com/userfiles/file/serabafubipenanuxitupije.pdfIn PDF document text
- https://gangwontaxi.com/FileData/ckfinder/files/20210621_69A9F9247D39DA60.pdfIn PDF document text
- http://lorichphoto.com/pictures/file/10488419179.pdfIn PDF document text
- http://singer-island-condos.com/userfiles/files/wubufazidafufunipilu.pdfIn PDF document text
- http://samuiluxurytravel.com/Uploads/file/disex.pdfIn PDF document text
- https://adreshosting.com/calisma2/files/uploads/96014665678.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3041de1aff---falapurewe.pdfIn PDF document text
- https://open-call.fr/uploaded/files/77758832276.pdfIn PDF document text
- https://mariellatriolo.it/public/file/jujalanelo.pdfIn PDF document text
- http://fullx.net/files/33614910199.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/udrkpuanb46vuhp4fdru2714ak/74466181900.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3ae1cc11c7c6b569baab710371bd026e/55125143292.pdfIn PDF document text
- https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/83f2a4c12564857e08d851513bc1d09e/2088122332.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3b360d5---rodezufumivesenewaz.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1c5e345eefcf939b865aaeb6c7987dce/felofinogat.pdfIn PDF document text
- http://businessvaluationapp.com//fck_files/file/85444196992.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7abhtr0pka8op5lk67au2353o1/14561134996.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fd95fbb9---32058959461.pdfIn PDF document text
- http://rogersdesignhouse.com/uploads/files/xivijogumegafutovagi.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d383a2d0---8949205667.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae8785a0b---21487719013.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ip9899fk5gkcgap40nea2qatp5/3806084923.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/55843b21da99532c934193e14beb9671/35616684593.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/18966762636.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=food+abstinence+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_off0000f1bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BB	10684 bytes
SHA-256: `df71d85cf55f6e7810fbb49f89eb9f348f3e9fecc3dad1c9043d53a857efd6b2`
`font_01_sfnt_off000109fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109FC	16964 bytes
SHA-256: `4f231005b18f338b77716464f52a37c4be3ea22468661112e59a379ca80928ae`
`font_02_sfnt_off00013650.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13650	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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