PDF malware analysis — malicious · f5f807104013f287

MALICIOUS

PDF

77.8 KB Created: 2021-08-27 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: bbecc0d5494bcf46cdb17d7f30144131 SHA-1: 9b1547f768a91ff8338e5cec5d75da7f385cf56e SHA-256: f5f807104013f2872bf3aea7cbdc78aef659d4ed805f38b99b7ba2fd967d9d0c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of multiple links on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160789314abd0c---8432510018.pdf In PDF document text
- http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
- http://studiomanzella.com/userfiles/files/ginurejejinodabizep.pdfIn PDF document text
- https://siroyensao.com/upload/files/72081607230.pdfIn PDF document text
- http://worldcar.jp/userfiles/files/dukiwijalunefudufiwonupo.pdfIn PDF document text
- http://landpas.pl/upload/file/givejevulififeri.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1d1c4e5f0c90689afb3acfd9b13dd63/xosegibojinesureligif.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882033bf8a6---sazerejudogabafulotite.pdfIn PDF document text
- http://ats-dz.com/userfiles/file/mofebodefod.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77fa01237f---7198051575.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lg00s82d916srtsinpertp7oe4/josoxeb.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/tanapifebawubenekesoj.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5acec6ff1---vojubexubegamuf.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608505c678431---pupiwufilu.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a438e0716c7729110d19bd7f9b789f11/33669512014.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956cd5bc53---9910254034.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/719811684a6836b99fff1f44e19eb9cd/patuvagurexikojap.pdfIn PDF document text
- https://dhesient.com/media/mevigimilo.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/153b4cb269a440dd140ac8cc102d7e85/toxinujituj.pdfIn PDF document text
- http://xahscw.com/userfiles/file/kenivaw.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9f1da5c9932dfc2b59f3a44ffb27b40f/basumovaweninozibu.pdfIn PDF document text
- http://galluccifaibano.it/userfiles/file/17189625796.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ec3c17---95900136010.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/87abed7b5a73a1fb982a46724df8a0a6/47480621561.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+does+the+lan+cable+doPDF 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_off0000ccee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCEE	17436 bytes
SHA-256: `e37ff449c22c7e2232bb51b0cd99f35270eef07d37f15af097f49dbc4d33b6ac`
`font_01_sfnt_off0000fa59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA59	10408 bytes
SHA-256: `f332b34e99084dd9c5e67198a0847dd603acc31b415965c98e8c1f53b47649bb`
`font_02_sfnt_off000111e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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