PDF malware analysis — malicious · b9201addb0f36eeb

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 06:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e702f78fa72472541a4647fe28b0aa38 SHA-1: ff97c23d260e2a463532fe304adfe1bef6040605 SHA-256: b9201addb0f36eebbaf4394ef93728a8db9cedce8395d455aef9eee1cd1557f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of external URI links and the link farm structure strongly indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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://nomylo.ru/uplcv?utm_term=advance+stamped+receipt+form PDF link annotation
- http://personnelstrategies.net/userfiles/file/37017340308.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/05e980bdc1dc07091f395df82b6e1b15/bosasolimirifabi.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/766f27588bfe0bddc9c0269c4fa432b5/gomavezexodup.pdfIn PDF document text
- http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/mitofiboj.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc5a4ebe9---rarotanako.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2ca7adeb---kiruwuwojababidivogovo.pdfIn PDF document text
- http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/korisunitunagitupaniridap.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608116fead8bd---daverobasowofebas.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05be2d891---bugavebamijakoxufisiloron.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19d5297d0---maxosojiwozuzaxokoludus.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3157b0bc0f---gesofafedojugurebid.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28442cb8a---7170928522.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4f62dad1---jalid.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9248df50617fd40d4298929ec57793c5/29934641571.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fc0c31be67bb24577acd168b33f35b58/gegujipir.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd04be14c2---13846287723.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2qvdu2q5n8qmo2gt0tglh1ckph/50010913129.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36ee4c9ac---lakiliratulodu.pdfIn PDF document text
- http://119hero.kr/userData/board/file/13515177409.pdfIn PDF document text
- http://kfbi.ru/content/file/rukolijiburamulatorepo.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c207506a707ec28c4943d566d25ef6ca/zizif.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd400a8a37---zurijirejox.pdfIn PDF document text
- https://bataretak.com/img/files/file/37948043858.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/texax.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb1e9b55a---50541283835.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddacd90789f---relapew.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
`font_00_sfnt_off0000d35e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD35E	10780 bytes
SHA-256: `0174f7ed8413ec1b36d5f4029de651f861a8e99a65a9334baab0d06de05b8aa8`
`font_01_sfnt_off0000ec34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC34	16804 bytes
SHA-256: `e49e3337986559b5cdf741dd07798bcbebff0aba55b69cd06366878232264222`
`font_02_sfnt_off00011801.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11801	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013012.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13012	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`

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