PDF malware analysis — malicious · d1aefe6211555818

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1372faa16d975c76f728f03b2170af14 SHA-1: 1bfa51dce7555f874693ebef17c51dc8f62c64a0 SHA-256: d1aefe6211555818d95de67437fd5225af31412f551eae7a43133d460d780bca

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 8

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://drafthe.ru/uplcv?utm_term=zarchiver+pro+latest+apk+download PDF link annotation
- https://gospel-streams.com/asset/ckfinder/userfiles/files/rolexizufa.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562a18f76a---1983930533.pdfIn PDF document text
- http://tagsu.com/attachments/fckattachments/file/bosezesofojasu.pdfIn PDF document text
- http://thenikharvconsultancy.com/userfiles/file/9029827328.pdfIn PDF document text
- http://tangneylaw.com/admin/images/file/depaxawafanetubutirimumuv.pdfIn PDF document text
- http://nusratali.com/userfiles/files/3637753892.pdfIn PDF document text
- https://xn--lenachatka-57b.pl/uploaded/file/8708909621.pdfIn PDF document text
- http://imhkayseri.com/resimler/files/98275566043.pdfIn PDF document text
- http://nyett.hk/uploads/news/files/19028266175.pdfIn PDF document text
- https://www.antoniopopolizio.it/ckfinder/userfiles/files/87612262348.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/26684046565.pdfIn PDF document text
- https://www.winsum.frl/ckfinder/userfiles/files/90515744203.pdfIn PDF document text
- https://profession-your-dr.com/uploads/files/202109040758022748.pdfIn PDF document text
- http://xinyuemu.net/assets/202109/files/20210908113512843472.pdfIn PDF document text
- https://mimpishio.com/contents/files/maruz.pdfIn PDF document text
- http://pawsandtiaras.com/ckfinder/userfiles/files/94731442540.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/jojusozudolexubepito.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99f6de89c---40569856124.pdfIn PDF document text
- https://langumeistras.lt/i/File/45263014590.pdfIn PDF document text
- http://kiapelhrimov.cz/UserFiles/File/zotol.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/84828361406.pdfIn PDF document text
- http://ceroki.com/image/files/riguxidajubanafu.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/08c12781745ca947775daaabc42001a0/87900057534.pdfIn PDF document text
- http://giaexploring.it/userfiles/files/86372024758.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/32127759232.pdfIn PDF document text
- http://irodori.kir.jp/files/file/zovulijimufigavegebuxefaf.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_off0000e64e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE64E	10816 bytes
SHA-256: `fb0dee8527f793f1f71f982094a91a1cd598bbad43e3bcc300550df9c0d32090`
`font_01_sfnt_off0000ff53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011765.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11765	18040 bytes
SHA-256: `6007d89b19b6fcbd6e27b79d0faf05b24b9663ff3b2ed3ac0a68c0ac5511a95d`

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