PDF malware analysis — malicious · fc79bd74ec5c2391

MALICIOUS

PDF

79.7 KB Created: 2021-06-09 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05

MD5: e81e42c8e28211c76c24ecbe46b8dd04 SHA-1: 23c4bf1b478ea57a564ad85c90ae102f4da507f8 SHA-256: fc79bd74ec5c2391bc89b95c10b9f11717a21ca55446b98e4ea2e57d4593b658

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 https://huntic.ru/uplcv?utm_term=pokemon+x+ppsspp PDF link annotation
- https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/72cd062976d043060fd56517ce96ccf6/43601671405.pdfIn PDF document text
- http://win-sonic.com/kida2018/ck_imgs/files/99006800802.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e9c7ef5f---52054585004.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8e9ec7e2b807e6f03cb1c50321f8d487/19199261921.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f278ceba48---wasanujutadasisen.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addcc9e4302---wezuwuwuzowojujirepalimaz.pdfIn PDF document text
- http://aclamerica.com/customers/CMS-IMAGES/file/fogorubomaxirud.pdfIn PDF document text
- http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/87f6cb6e6fe4cf4eaf8c2eb9720e8b15/55372265421.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ced90e4e---ruwenekibevuna.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795cd3da95b---mitipowewufudot.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/860cba1cbefffd613c75dd91496b229e/97275299905.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1f5a42007c0082698060152b245163f4/wakaguxivi.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/piserimorizuwukapopa.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB27	4692 bytes
SHA-256: `d4d76cc72a0508a0df3259ca30e40b4493148d8623903a05cb3e77a3e0dd962b`
`font_01_sfnt_off0000fbc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBC0	4760 bytes
SHA-256: `f4d11f2772583ef78c9f8d7acd2dfcb1c8455d2f387541ab27477a1251d576d8`
`font_02_sfnt_off00010bed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BED	10856 bytes
SHA-256: `e6c47fe093e15f7d84199eb301307b41480e44a4eba45962f0e535ae7f2768d9`

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