PDF malware analysis — malicious · 8fa271983ad86f50

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 11:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e76c2adc171ab62f7aa0adb9a578eda2 SHA-1: 341348a2e445ddc54dd8244ab6e4f315d23f030c SHA-256: 8fa271983ad86f50d4f7a365d9ffc158a11696cda0ebcfb52f9adc8c516e836e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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=capital+business+systems+private+limited PDF link annotation
- http://posekatzahradu.cz/files/file/72962559738.pdfIn PDF document text
- http://wccflooring.com/userfiles/files/59474323520.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c1a769b42027ce8a4a0d5d52a8ceb43a/89791435917.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/316739ccdd8205b1ff445dfd7475bf1a/zupetawupenabovolona.pdfIn PDF document text
- http://www.alcera.ca/userfiles/file/84483931882.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/40449991032.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/43dbbedfe468985de665d5c0ca11ae8e/tupigoloxavamoma.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786589d7400---66798436701.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0pu2nm1j8e1g5bgq5291t1h73o/gugesidajexapa.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d377c400b3f3eeade93e0652db807db3/5027316542.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/dikatavukagoloton.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/83142773445.pdfIn PDF document text
- http://proxima-design.cz/files/file/nunewegotisawesovaraluwu.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c48168e8c4---8927438855.pdfIn PDF document text
- http://aldara-latinoamerica.com/userfiles/file/32933017417.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e6adfb684053de6a56930c94711bae81/sajazerilep.pdfIn PDF document text
- https://arerp.kr/data/file///sewajuxazazolo.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c427928dd6c---8822719779.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f31320cf9---46768322458.pdfIn PDF document text
- http://ggmtc.net/userfiles/files/93738665924.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1aeba8f7bdc56d2a0d45d09a1d774f3e/82251005708.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c76da74518f---lubobu.pdfIn PDF document text
- http://nuestratierrapremios.com/campannas/file/marafetabigitegej.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/44e156f28b6c90274cc7281c8249f1fa/91498387293.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_off0000edd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD3	10884 bytes
SHA-256: `3f448e2a73b97f99c0f13bf989eda128f9b877cd66df5c5f098c5ea2b22f5c59`
`font_01_sfnt_off000106c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106C8	16464 bytes
SHA-256: `9eff81141166bcdad3d540342317c758088bf4360e36ac5140035b8337357eb4`
`font_02_sfnt_off00013174.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13174	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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