PDF malware analysis — malicious · 024621da4f831932

MALICIOUS

PDF

97.5 KB Created: 2021-08-09 14:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6a264d2b41ca68a80fcf29d68b804949 SHA-1: 6b8ea0911e15912c2c99225fc712969e28b48bdb SHA-256: 024621da4f83193242751f4a3f1c9cf37e75f6d7c0ebae89cfff620595ea8331

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or link-farming campaign. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=how+to+download+a+skyblock+map+on+xbox+one', are designed to lure users with deceptive content. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=how+to+download+a+skyblock+map+on+xbox+one PDF link annotation
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a2d1c9d32c8fd73421bac1dacc3759e7/xorexafako.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d211ea5fde---22683137356.pdfIn PDF document text
- http://nexxosrealty.com/userfiles/files/rejabagozadoraroj.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i1u0bbrcptd9vdg0jjubdos8sg/xagulekabaf.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd28398f8---73218590494.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a916a47f0---3880875505.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d9997695e5ba7c952a788096f3a2d5e9/62027848474.pdfIn PDF document text
- https://igruppe.no/ckfinder/userfiles//files/23168857474.pdfIn PDF document text
- http://computer-rudolstadt.de/upload/file/79884878916.pdfIn PDF document text
- https://silky.ae/images/bulk_images/files/92868180861.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14498d178---fifukiwapupos.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/wuxuze.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62d8b9f02---25300050780.pdfIn PDF document text
- https://ibeguiristain.com/userfiles/files/dilefetu.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7a5f2e10---50184775732.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/02ra3m3lkamm4clg9rgcb7nu0u/nimokufugevolilebuvog.pdfIn PDF document text
- http://palami.by/images/file/48507981410.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/than8amp8a2csrhaq589hgk4m2/jaxogeviw.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ff5b4c0a483db8f3a8d89de8e769b13/tarevakagixumune.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ccc283645---kezafe.pdfIn PDF document text
- http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/81993317133.pdfIn PDF document text
- http://elm3rad.com/file/44048225927.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tewuletapomab.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/15268252356.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8q2f6cbpc00tq65sgf8jnrd0n3/vodeliredaditupuxijipipa.pdfIn 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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off000157fe.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x157FE	19408 bytes
SHA-256: `791dc900cfcf4390f119828b1250b092bba865e47fa50f098c433a0d226fc23a`
`font_00_sfnt_off0000f629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF629	18816 bytes
SHA-256: `053b5c7b8f3a32a086d0342673dc1ce0cf50a4de57a785afc2f6409fd9106da4`
`font_01_sfnt_off00012671.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12671	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013e88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E88	11008 bytes
SHA-256: `65df4721c1ad65b39fa81d27fe51d332f002cb48c4a2da18e1789a0a1a0f3cd3`

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