PDF malware analysis — malicious · f31f1379a36443a8

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 12:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 049bb16dbdf66ed32db9737b786cb642 SHA-1: ed5b622da7f67ca7a9581e5751235f8533221f7d SHA-256: f31f1379a36443a87f355cd4d97cc2ecdf9a17bdad886957d37ed865df541c0d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The embedded URLs and link farm heuristics suggest the document's primary purpose is to redirect users to potentially compromised or malicious websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://pistant.ru/uplcv?utm_term=how+to+inspect+element+on+android+without+computer PDF link annotation
- http://lovesushiscv.com/uploads/files/15141676227.pdfIn PDF document text
- https://pass-eco-energies.com/ckfinder/userfiles/files/lumujogadavakewixozalufob.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/4804783017.pdfIn PDF document text
- http://sowa-architekci.pl/userfiles/files/5221524156.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5b678ea3---81692544987.pdfIn PDF document text
- https://doluhosting.com/calisma2/files/uploads/wijovototajazowoninukuna.pdfIn PDF document text
- https://0286869143.com/editor_images/files/25173201999.pdfIn PDF document text
- https://burragebrothers.com/demo/jolie/beta/userfiles/files/pijatebepazo.pdfIn PDF document text
- http://tieulongcopro.com/luutru/files/retawok.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a14e617a5---41571030321.pdfIn PDF document text
- https://branchennachweis.eu/userfiles/file/valudotuxi.pdfIn PDF document text
- http://unite-chem.cn/upload/files/72095095486.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8adb6c5decd9d379a37717f71bdf7185/vabiriw.pdfIn PDF document text
- http://julianina.dk/upload/file/40179192696.pdfIn PDF document text
- https://hlj-vibration.com/uploads/image/20210910/files/20210910230130.pdfIn PDF document text
- https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/47352294333.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/13924154374.pdfIn PDF document text
- http://clubesquilacoma.com/uploads/files/19818209318.pdfIn PDF document text
- http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/91739558352.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e4fe69c2fdc5d395aca2fd3124d225e4/87576208307.pdfIn PDF document text
- http://quangphong.vn/uploads/image/files/37057612758.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30b62069b---badezixeworukuz.pdfIn PDF document text
- http://nhadatv.com/webroot/img/files/fuvosuza.pdfIn PDF document text
- http://vecsecity.info/editor_up/motaka.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_off0000e0d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D6	10956 bytes
SHA-256: `c48a6ab5334e40955deeb42c6f9c1d1ba2310ca8ff0ff06eaef5e0d16bece9b3`
`font_01_sfnt_off0000fa08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA08	17024 bytes
SHA-256: `2940a243fc4c3735cbc7688a082858d576bf87226f18b55eb10f66662cc607ec`
`font_02_sfnt_off00012609.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12609	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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