PDF malware analysis — malicious · 2ca64cabf1deb0d4

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 03:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4562012a95c94a3e15e8e6a832bfc3c6 SHA-1: 8932fff5318e9c6b72bffe8566fd7a8edeb1901d SHA-256: 2ca64cabf1deb0d456f82b6706030ff65fd092b9d42c6df65305556f47f2e20f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://hersheyhigh1981.com/clients/37302/File/jodefoduzab.pdf In PDF document text
- http://daiichibus.vn/uploads/news_file/ginajan.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tb6nogk53ispusl5b2blv0pnts/86891580660.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/lixob.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/65818435112.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zilemozigegofi.pdfIn PDF document text
- http://status.cz/UserFiles/File/leduxowelobofo.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/65441829484.pdfIn PDF document text
- http://elhammagazine.com/ckfinder/userfiles/files/59448384273.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2a9d115f---8414713731.pdfIn PDF document text
- https://gangnampools.com/contents//files/bajosijizobipavadole.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7a2ca4f0---piximuxo.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/71843844649.pdfIn PDF document text
- http://seoulgreeter.com/userData/board/file/47291721806.pdfIn PDF document text
- http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/7773302344.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4344a0ffabfd4bb553cec7f5287de886/81038847985.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdfIn PDF document text
- https://rhodium.vn/uploads/news_file/11525495136.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bc21a82b161cf41b1dea4da501fdd52/88310598534.pdfIn PDF document text
- http://reicar.dk/userfiles/file/funebojewuxowi.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e2bc614---52079384199.pdfIn PDF document text
- http://yeditepegumruk.com/userfiles/41984040390.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a2d402552a6b31a459309ae3a4dccaf6/19699076106.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/69558542179.pdfIn PDF document text
- http://tcgardening.com/userfiles/file/2021073011420273499.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tamales+near+me+nowPDF link annotation
- 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_off0000c219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC219	17124 bytes
SHA-256: `412816e084384665fdbea84562783acddf88698c1bf40dcf55ed439ff9c1e6c9`
`font_01_sfnt_off0000ed89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED89	10128 bytes
SHA-256: `5ff5a8285270f19152933c009c51f80022dbcb2554c81b207d14aa195e64dd28`
`font_02_sfnt_off0001042f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1042F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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