PDF malware analysis — malicious · 066844aa26c68c13

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 06:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 12022e762bc3ffc61768a09279454be1 SHA-1: 994c9b6b8c7cf9193746eb24e661a90af5436f20 SHA-256: 066844aa26c68c13f53e5330a87f597864be3d17920db9c5a121d3e96733fb55

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://queure.ru/uplcv?utm_term=how+to+screenshot+on+instagram+android PDF link annotation
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1800a074a29712191e378ef354e2cd00/73962087442.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/famuzupemaduzugiregipezu.pdfIn PDF document text
- http://sungwoo-n.com/userfiles/file/zolusadurogowozaju.pdfIn PDF document text
- http://gyermekhaz.hu/Content/site_images/files/jedamisatudovudugetebus.pdfIn PDF document text
- http://www.optimizecost.com/admin/ficheros_fckedit_subidos/vesomerefebo.pdfIn PDF document text
- http://dansensvenner.dk/imagesfile///90727161769.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/24790746834.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6dd2d1c158c127fc158fd72a39fae08/jabatinuzijuvazok.pdfIn PDF document text
- https://piataafacerilor.ro/app/webroot/files/userfiles/files/69505342697.pdfIn PDF document text
- http://xn--80aab8aioy.xn--p1ai/userfiles/file/53830220619.pdfIn PDF document text
- http://abwingsmd.com/uploads/files/noxuvegiterumaxaz.pdfIn PDF document text
- https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xadorogewalidup.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/07d8a1345ee7fffcdd1b2833ecb94838/35804086701.pdfIn PDF document text
- http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/palotugimafukomifobobid.pdfIn PDF document text
- http://icmasistemas.com/userfiles/files/xuledafatopalud.pdfIn PDF document text
- http://dentalcenterstudio.it/userfiles/files/49048616659.pdfIn PDF document text
- https://autonoleggioassereto.com/file/65124884066.pdfIn PDF document text
- http://nm-union.ru/ckfinder/userfiles/files/nojowe.pdfIn PDF document text
- https://ltes.tw-goods.com/UserFiles/files/lawuxunubakajoxar.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/59496160043.pdfIn PDF document text
- http://lesmashclub.com/imgUpload/files/durasozomajoriponus.pdfIn PDF document text
- https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/pajutidep.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/98471304827.pdfIn PDF document text
- http://koddous.com/userfiles/file/77051820849.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD429	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ec3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC3B	17808 bytes
SHA-256: `d8bc2e9faa838ca232a1e084397eb8d2860a5e7c5c90013919f7c913b62afbd3`
`font_02_sfnt_off000119e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119E9	10848 bytes
SHA-256: `e33d54c6b94487a1b3fc671ad07d533d8e346f1fc0d69e892a09544da1d8a93d`

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