PDF malware analysis — malicious · 845f8a9a1ba39443

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 10:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 767d61c8250dfda9efa179a991321a9d SHA-1: ac2d9ba1bb4b6f8dfa745edf79336a9bdb546109 SHA-256: 845f8a9a1ba394431a92db46fcc6840da9553530962a729bf7923756802b5ba9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=free+fire+online+play+apk', are likely used to distribute phishing content or further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=free+fire+online+play+apk PDF link annotation
- http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92987766649.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f55b91fcc---55474033731.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4q89kdfkasti0g880g3kovj3pa/48498447343.pdfIn PDF document text
- http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/fawuwamibo.pdfIn PDF document text
- https://ghadir-eng.com/userfiles/files/kopunus.pdfIn PDF document text
- https://beldaoyun.com/calisma2/files/uploads/fidor.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/67e7c6c10af705b151387d53055822a0/46059805401.pdfIn PDF document text
- http://tai-yang.tw/taiyang/upload/file/81192874871.pdfIn PDF document text
- http://henanshuangxin.com/d/files/87152423923.pdfIn PDF document text
- http://softwaretesting.kr/club/data/userfiles/file/20210910060456.pdfIn PDF document text
- https://clubsecurite.fr/webroot/upload/files/5742158481.pdfIn PDF document text
- http://gptools.net/userfiles/file/90243909486.pdfIn PDF document text
- https://creteservices.com/FCKeditor/userimages/file/bokaworonitukemage.pdfIn PDF document text
- https://www.zochrot.org/ckfinder/userfiles/files/21639462352.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd75103b1---93869400488.pdfIn PDF document text
- http://safeabortionnepal.com/userfiles/file/fikuzerejakozibili.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142940d2b4c4---42130473106.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c40e3907a---3811499521.pdfIn PDF document text
- http://confidenzacsapagy.hu/upload/63916235691.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/pavegepojozubenomijizel.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/kizevaxu.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ca28965b145a9f853440dc2c619c84da/rovuzutiwezojukalomukal.pdfIn PDF document text
- http://pc75.net/upfiles/file/1631502118.pdfIn PDF document text
- https://kozlovka.mebel18.com/uploads/files/29150462338.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_off0000dcb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCB9	10268 bytes
SHA-256: `c1ed17fe21d29dd0089a67e06613daa40e5603bb9be7e313231ef0e9612e8a18`
`font_01_sfnt_off0000f3df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010bf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF1	16920 bytes
SHA-256: `e044ea20b66bd34e8546aaa02b4ec507bdb160596b2e36978610699876ea5694`

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